"We live on a world of wonders a place of astonishing beauty and complexity." "There are vast oceans and incredible weather giant mountains and stunning landscapes." "I'm a physicist and I'm fascinated by the way that the universal laws of nature that made all this also created such diverse and different worlds out there in the Solar System." "I think we're living through the greatest age of discovery our civilization has known." "We've voyaged to the farthest reaches of the Solar System." "We've photographed strange new worlds stood in unfamiliar landscapes tasted alien air." "But the one thing we haven't found on those worlds is the thing that makes our planet unique" "life." "But is that really true?" "Is the Earth the only place in the Solar System that could support life?" "In this film we will search the Solar System for worlds that harbor the conditions to support life." "What we find on these worlds may help us answer the question" ""Are we alone in the universe?"" "That's not only one of the great fundamental questions for science but one of the great unanswered questions in human history." "Floating in the Sea of Cortez off the coast of Mexico is the research vessel Atlantis the mothership for the exploration of one of the most alien worlds we know." "But it's an alien world on our planet." "The Atlantis is the launch vessel for Alvin one of the world's most rugged submarines." "Built like a spacecraft it's designed to explore the deepest depths of the ocean." "And I'm lucky enough to have hitched a ride down to the sea floor two kilometers beneath the surface." "It is honestly got to be the closest thing to going into space that you can do." "And given that I'm not going to go into space anytime soon" "I think this is the next best thing." "See you in eight hours." "Starboard's on!" "Port's on!" "Roger Alvin your checks are good and you have permission to dive when the swimmers are clear." "Roger swimmers Alvin diving." "The parallels to spaceflight are obvious." "As the tiny capsule descends we're leaving the familiar world of the surface of our planet and entering a strange hostile world." "If anything goes wrong we will be completely on our own." "Beeping's never good." "Fortunately Alvin is one of only a handful of submarines that can withstand the colossal pressure of the deep ocean." "At the Earth's surface we're used to one atmosphere of pressure." "As we descend the pressure increases by another atmosphere every 10 meters." "And it soon adds up." "So we're just approaching a kilometer deep." "The pressure outside there is now what 100 atmospheres?" "That's higher than the atmospheric pressure on the surface of Venus." "Without knowing if you were asked the question" ""Could life exist down here?" Hundred atmospheres." "Cold dark no sign of sunlight at all." "It's pitch black there." "You would say no." "Or I would say no." "But the depths of the ocean are not lifeless." "Illuminated by Alvin's lights we find oases of life in the deserts of the ocean floor." "My depth is 2013 20-13 PB neutral trim." "So we've landed after about an hour of descent." "We've just stopped in the most incredible place." "Look at those." "We've landed on top of the tube worms." "Amazing things." "This underwater city is one of the most bizarre environments on our planet." "It's built around a hydrothermal vent a volcanic opening in the Earth's crust that pumps out clouds of sulphurous chemicals and water heated to nearly 300 Celsius." "And somehow life has found a way to thrive in these most extreme conditions." "You know this is a genuinely remarkable place." "There are mats carpets of yellow bacteria." "Look at that!" "It's not only just bacterial blobs it's real complex organisms." "Alien." "I want to say that word "alien environment"." "It really is alien to us." "For me the fascinating thing about finding life down here is that the conditions on the deep ocean floor are more similar in many ways to the conditions on worlds hundreds of millions of kilometers away out there in the Solar System" "than they are to the conditions just 2 kilometers above my head on the Earth's surface." "Now it's incredibly dark there's no sunlight." "There's a brutal mixture of hot and cold water and just well rock and minerals." "So if life can not only survive but even flourish in these conditions then you've got to feel that it's much more likely that life can also survive and flourish out there in the Solar System." "Ever since the invention of the telescope 400 years ago we've looked to our neighboring worlds for signs of life." "As technology has improved we've been able to search the planets in more and more detail and we've found nothing." "But that doesn't mean the rest of the Solar System is dead because we're only beginning to scratch the surface of what's out there." "There are literally hundreds of other worlds planets and their moons which we've barely explored." "Among them may be worlds that hold the conditions to support life." "And the best way to find out what those conditions are is to look at the one place we know life flourishes" "the Earth." "You know life is pretty much only chemistry." "It's just the reactions between atoms and molecules." "And so for life to exist you only really need three things." "First of all you need the right chemistry set." "Now I'm made of something like 40 elements almost half of the known elements which is pretty complicated." "But actually 96% of me is only made of four of them." "Carbon nitrogen oxygen and hydrogen." "Secondly you need a power source." "You need a battery something to make a flow of electrons that powers the processes of life." "Now here on Earth most life uses the power of the Sun." "And thirdly you need some kind of medium for life to play itself out for those processes to happen." "And here on Earth you don't have to look very far at all to find that medium that solvent." "'Cause it's this water." "If you want to see how important water is to life there's no better place to come than the Atacama Desert in Chile." "The soil here it's more sterile than a hospital operating theatre." "And in fact scientists have looked for the most basic form of life bacteria in some parts of the Atacama and they found absolutely nothing." "All deserts are characterized by a lack of moisture but the Atacama takes that to the extremes." "The Sahara is 50 times wetter than the Atacama." "There are weather stations here that have measured one millimeter of rainfall in ten years." "There are river valleys that have been dry for 120000 years and there are rocks that haven't seen rainfall for 20 million years." "It's this dryness that explains why nothing can survive here." "Even the most primitive form of life on Earth the bacteria need water for their survival." "And there are no exceptions." "And this seemingly fundamental link between water and life is driving the search for life out there in the Solar System because wherever we find water that will be the best place to look for life beyond the Earth." "The Earth is the only planet that currently has liquid water on its surface." "The other planets are either too close to the Sun like Mercury and baked dry" "or they're too far away." "Saturn's rings are made of water but in the depths of space it's frozen into lumps of solid ice." "But that doesn't mean that liquid water has never existed elsewhere in the Solar System." "And if it has we should be able to find the evidence because wherever water goes it leaves its footprints." "These are the Scablands a remote part of the northwestern United States." "It's one of the most spectacular places to come to see how water carves its signature into the landscape." "The largest flood on Earth went through this area here." "Jim Rice is an astrogeologist." "He believes that understanding the events that created this landscape can help in the search for water on other planets." "We're kind of like a CSI arriving at the scene of a crime after it has already happened." "This is the evidence left here trying to piece it together." "I can see this is not a normal river system you can just see 'cause it's so straight." "You know there's no meandering of a river here it's a just a big hole." "This entire landscape was created at the end of the last Ice Age." "Two hundred miles to the east lay a huge lake held in place by a wall of glacial ice." "When that wall ruptured over 2000 cubic kilometers of water swept out in a single catastrophic event." "The flood waters were at least 400 feet deep here but actually they were another 200 feet stacked on top of that coming across here." "So we would be under 200 feet of water standing right here." "So am I to imagine a wave?" "Yeah a massive wave rolling rumbling this water would be charged with big chunks of ice from the ice dam." "It would be loaded with big chunks of basalt bedrock being gouged and ripped out of here." "It would be an impressive sight." "As the floodwaters tore across the landscape they carved out this 20-mile long canyon." "And at its head it left these giant horseshoes." "At over four hundred feet high and five miles across this was the largest waterfall the world has ever known." "The easiest way to think about it is if you took every river in the world put them in the same location had them flowing at the same time these floods are 10 times larger than that." "And how long do we think it took to sculpt this landscape?" "Forty eight hours to a week." "It's instantaneous geologically." "The Scablands reveal the characteristic signature that water carves into the landscape." "It's a signature that can be seen from space and not just on the Earth." "When we turn our telescopes on our next-door neighbor and prime candidate for finding alien life the planet Mars we find almost identical features cut into its surface." "The Red Planet is covered in outflow channels straight wide canyons exactly like the Scablands." "And they're filled with identical geological features." "It all suggests that similar huge floods once tore across the surface of Mars." "This is a picture of here from the air I'm sat somewhere around here." "And here are the horseshoe shapes of the dry falls which are just over there." "This is a picture taken of the surface of Mars and you see those typical horseshoe shapes of the falls." "Also you see these structures upstream of the falls these grooves cut into the landscape." "And you see that here grooves cut into the landscape as the water cascades down and then flows over the falls and cuts the gigantic valleys out as it moves downstream." "So all this adds up" "I think to an overwhelming smoking gun that there were vast amounts of water that flowed very quickly over the surface of Mars at some point in the past." "But although the outflow channels are proof that liquid water once flowed across Mars it may not point to the existence of life." "Because if the Martian landscapes were formed by the same processes that formed the Scablands on Earth the floods that created them may only have lasted a matter of days." "Now for life to get a foothold you need more than that." "You need areas of standing water lakes and rivers that persist for millions of years." "Now in order to look for evidence of that standing water we've done the only thing that we can we've sent an army of robotic explorers to the surface of the planet." "Touchdown!" "We have touchdown." "Extensions on." "Over the last thirty five years we've landed six robot probes on Mars." "And one of them Opportunity is still rolling across the surface investigating the Martian geology." "The Mars rovers have really captured our imaginations." "I suppose because they genuinely are explorers in the old-fashioned sense." "You know they're the extension of our senses to the surface of another world." "But they've also been very important scientifically because you can't really get to know another planet from orbit." "You've got to get down onto the surface you've got to touch it you've got to dig down and examine it microscopically." "And the rovers really have by doing that made some extremely important scientific discoveries." "One of the most significant of those discoveries was made in November 2004." "The Opportunity rover was examining an impact feature called the Endurance Crater when it detected deposits of a remarkable mineral." "This is the world's largest saltworks on the Baja peninsula in Mexico." "And what they do here is just pump seawater into these lagoons and let it evaporate." "Now what they're after is this stuff which is sodium chloride table salt." "But at different stages different salts and different minerals crystallize out so all the things really that are in seawater emerge crystallize out at different stages of the process." "In one of the lagoons Pond number 9 the seawater is at exactly the right concentration to precipitate out these beautiful crystals that cover the entire floor of the lagoon." "This is gypsum." "And it's exactly the same stuff that Opportunity found on the surface of Mars." "Now what's interesting about that discovery is how you make gypsum." "You see its chemical formula is CaSO4 so it's calcium sulphate dihydrate 2 H2O." "That's water." "So the only way we know of the only way to make gypsum here on Earth is to have calcium and sulphate ions in the presence of liquid water." "So large deposits of gypsum on the surface of Mars tells you that there must have been big areas of water present for a very long time." "The discovery of gypsum has helped to build a picture of an ancient Mars that was much warmer and wetter." "Subsequent discoveries of gypsum in networks of sand dunes suggest that large areas of Mars were once covered in standing water." "And where there is standing water there is the chance of life." "This area of the salt flats is we think very similar to areas that have been seen on Mars." "And it certainly looks extremely inhospitable." "I mean it's hard at first sight to see how anything could live here." "But if you just dig a tiny bit below the surface then you see that this layer of gypsum is only a few millimeters thick." "And then immediately the ground beneath it turns this greeny color." "Now it's green because that is bacteria that thrive in these seemingly inhospitable conditions." "Now if these bacteria can survive here then there seems to be no good reason why they couldn't also have survived and even flourished on Mars when there was water present at some point in the very distant past." "But although it may once have been more hospitable any liquid water has long since disappeared from the surface of Mars." "About three billion years ago it died as a planet." "Its core froze and the volcanoes that had produced its atmosphere seized up." "The solar wind stripped away the remains of that atmosphere." "Any liquid water would have evaporated or soaked into the soil where it froze." "It left the surface of Mars too cold too exposed and too dry to support life." "Now it's highly unlikely that there will be life on the surface of Mars today." "But that's not to say that life couldn't exist somewhere on the Red Planet." "Maybe we're just looking in the wrong place." "There are other potential habitats for life on Mars." "Detailed pictures of the surface show the entrances to caves revealing the existence of a world beneath the Martian surface." "We know there may be water down there." "Satellite data shows permafrost ice frozen in the soil." "Deep below the surface that ice may melt to form liquid water." "It all hints at an undiscovered subterranean world that may be a more likely place to find life." "You know if you were to imagine the perfect habitat for life then it would surely be somewhere like this." "You know a warm climate lots of liquid water a beautiful dense atmosphere and you see the results everywhere." "There's life everywhere you look." "All the life we're familiar with thrives in pretty much the same conditions that we do driven by the heat and light of the sun." "But this is by no means the only life on Earth." "There's another living planet hidden beneath the surface that exists in completely different conditions." "It raises fascinating possibilities for the caves on Mars." "This is the Cueva de Villa Luz in Tabasco Mexico." "The cave of the house of light." "And it is the definition of a hostile environment to me." "Because it's full of hydrogen sulphide gas hence the gas monitor which says at the moment one part per million hydrogen sulphide." "Very toxic for me." "Which is why I've got this gas mask in case it all gets too much." "So it's a place where you at first sight would not expect a great many life forms to survive and flourish." "Although the cave is a death trap for us that doesn't mean that nothing lives in here." "In fact it's teeming with life." "Well look at these fish just everywhere in the cave water." "And they're adapted to live in these conditions." "In fact if you look at them closely they're quite pink and that's thought to be because they've got lots of hemoglobin because there's not that much oxygen down here and so they need to have an efficient way" "of moving oxygen around their bodies." "Beautiful." "But the really interesting life is found in the depths of the caves where the concentration of poisonous gas is high enough to set off my alarm." "Down here far from the light of the sun are organisms whose energy source comes from the air around them." "They use the hydrogen sulphide gas bubbling up through these springs." "The same gas that could be fatally poisonous to me is their source of life." "Well these things are what I came deep underground to see." "These are snottites." "And you can see why they're called that." "They're really one of the most alien life forms that I can conceive of on the Earth because they metabolize hydrogen sulphide." "So they metabolize this..." "faintly acidic and nasty gas that I'm breathing in now." "You can almost feel it on your tongue actually the acidity of it." "They metabolize it they react it with oxygen and they produce sulphuric acid." "So their breathing process if you like their version of what I do" "I breathe in oxygen and react that with sugars to produce you know breathe out CO2 and get energy." "These guys breathe in hydrogen sulphide and oxygen and produce sulphuric acid." "In fact I can test it here with this." "There you see look at that." "That well what looks like water that secretion dripping off the snottites has actually got a pH of well it's now about between 0.5 and zero." "I mean that's strong acid." "That's as strong as battery acid." "It's actually highly concentrated sulphuric acid." "So what a strange organism." "It's alien in every sense of the word except that it's present on the well just below the surface of our planet." "And the snottites are not alone." "Organisms that can extract energy from the minerals around them are found under the ground all over the world." "In fact this way of life is so successful that it's thought there may be more life living beneath the Earth's surface than there is on it." "And that raises an intriguing possibility." "If life can thrive below the Earth's surface why couldn't organisms like snottites survive and flourish beneath the surface of Mars?" "If you think about it living below the surface of Mars might actually be quite a good idea because the surface is incredibly hostile you know subjected to intense ultraviolet radiation from the Sun." "It's a very cold place and the atmospheric pressure doesn't allow liquid water to exist on the surface." "But if there is life below the surface of Mars then obviously we have a problem." "How could you possibly detect it?" "Well actually there is a perhaps tantalizing clue that there might be something interesting going on below the Martian surface." "Well these are termites or white ants." "And they're very unusual animals because they eat wood." "This is their food." "And there are many many species of these." "Billions of individuals across the planet." "And in the process of digesting wood they produce the gas methane." "And because there are so many of them they actually produce an estimated 50 million tonnes of methane and pump it into the Earth's atmosphere every year." "And it's not just termites." "There's lots of methane naturally in our atmosphere." "It's all produced either biologically or by active geological processes like mud volcanoes." "And that makes it all the more surprising that methane has been detected in the atmosphere of the supposedly dead planet Mars." "It was telescopes on Earth using infrared spectroscopy that first identified methane in Mars' tenuous atmosphere." "Those first measurements appeared to show only tiny amounts." "But closer observations have revealed that the gas is concentrated in a handful of plumes that vary with the seasons." "In the warmer summer months thousands of tonnes of the gas is released from vents in the surface." "Something under the surface of Mars must be producing it." "It may be coming from previously unknown geological processes." "But it could be that it's coming from a biological source." "Now no one I don't think is seriously suggesting that there are termites running around beneath the surface of Mars." "But it's not actually the termites that are particularly interesting about this story it's the way they digest the wood." "You see they use symbiotic bacteria bacteria that live in their guts called archaea." "And archaea these bacteria that can digest wood and produce methane are the most common organisms beneath the surface of the Earth." "The snottites are members of the archaea as are many of the microorganisms found living around deep sea hydrothermal vents." "In fact it's archaea that we find thriving in many of the Earth's most extreme environments." "So I think it's quite a fascinating prospect that the methane we see in Mars' atmosphere might just be produced by organisms like archaea living below the Martian surface." "But while Mars remains a tantalizing possibility it's no longer the only place in the Solar System we think could harbor alien life." "Far out a billion kilometers from the Sun the Solar System becomes a very different place." "The planets like Saturn are made of gas not rock." "There's plenty of water out here but it's frozen solid." "The planets are surrounded by networks of moons carved from ice." "They are cold and desolate." "They don't seem likely places to find life." "Any places on Earth remotely similar are completely barren." "This is central Iceland and at this time of the year in mid-November it's an increasingly inhospitable place." "I mean it's about 3:00 in the afternoon and it's already well below freezing." "The Sun is dipping below the horizon." "And it will stay this way for another six months." "And there's pretty much no visible life here at all." "There are no trees no grass." "And just listen." "No insects no birds nothing." "But it's because these places are so cold and inhospitable that they are of increasing interest to astrobiologists." "Because discoveries in these frozen places of Earth have raised new hope of finding life amongst the icy worlds of the outer Solar System." "And in those frozen wastes we have found one world that's of particular interest." "It's one of Jupiter's moons." "Jupiter has a vast network of moons." "The four largest have been known since they were discovered by Galileo in 1610." "And they are a varied bunch." "Closest to the planet is the tortured moon Io." "It's torn apart by volcanoes that carpet its surface with bright yellow sulphur." "In total contrast to the heat of Io comes its neighbor the ice moon Europa." "It's about the same size as our Moon." "And it's the smoothest body in the Solar System." "Its surface is made of an unbroken shell of ice though it's etched with a network of mysterious red markings." "It exists at a chilly minus 160 Celsius." "It seems an incredibly unlikely home for life." "The photographs of Europa from space reveal a vast icy wilderness." "But if you look more closely then you start to see surface features and those features tell you a lot about what's going on deep beneath the ice." "Close up we can see deep cracks that crisscross the surface of Europa." "At higher magnification we see areas where the ice has been broken into icebergs and jumbled up before refreezing." "We see the same formations in sea ice on Earth where the movements of the ocean have caused the ice to bend and crack." "It suggests something similar may be happening on Europa." "But it is the way the cracks are broken and fractured that provides the compelling evidence that there is liquid water on Europa." "You see as Europa orbits around Jupiter" "Jupiter's intense gravity stretches and squashes the moon and that stresses the ice and causes it to fracture and crack." "But the position of those cracks is not quite where you'd expect it to be." "And the explanation for that is that the icy surface of Europa has shifted it's moved relative to the rocky core." "And the only way that could happen is if there's a layer or an ocean of liquid water surrounding the rocky core that allows the outer ice surface to slip around." "Measurements of Europa's magnetic field have confirmed that its icy shell is sitting on top of a salty ocean that may be a staggering 100 kilometers deep." "That would mean that there is more than twice as much life-giving liquid water on this tiny moon than there is on planet Earth." "But it's not just the discovery of the hidden ocean that makes us believe that Europa may be the most likely home to alien life." "And that's why I've come to this spectacular ice cave in the Vatnajokull Glacier." "You see the laws of nature are universal." "And that may not only apply to the laws of physics but to also to the laws of biology as well." "And if that's the case then what we find in these ice caves of Iceland may tell us something about what we might expect to find below the frozen surface of Europa." "You know it's hard to describe this place." "I mean it's absolutely magnificent." "Visually the quality of the ice it's just completely transparent and clear." "You can see straight through it." "The cave tunnels into the heart of the glacier where the ice has been frozen for 1000 years." "It's what astrobiologists find in this ice that makes us think that Europa could be teeming with life." "NASA scientist Richard Hoover has spent his career looking for life in unlikely places." "Well that went very well." "Okay." "So will any organisms that you find in that ice be living in a sense that I would understand it?" "Are they actually alive now and metabolizing?" "For a long time it was thought that ice micro organisms were present only in a state of what is called deep anabiosis suspended animation." "It's now becoming quite clear that that isn't necessarily the case for all the micro organisms." "There maybe others that are actually actively living in the ice." "That's quite incredible." "So in this glacier the whole place this whole cave may be populated by living things not frozen things." "But things existing living cell dividing reproducing" "all the things that you do." "Cells dividing reproducing all of this." "It's this prospect of finding things living in solid ice that has had the greatest impact on our ideas of where life could survive in the Solar System." "Okay we're at lowest magnification." "That's one hundred thousand millionths of a meter." "Yeah." "We have bacteria." "Yes." "So these are organisms that have been trapped in that glacier" "for thousands of years." "Yes." "Ah!" "Look at this." "Beautiful." "You're seeing life in ice." "It's amazing." "We now know that some microorganisms are capable of actually causing the ice to melt because they generate essentially antifreeze proteins." "They change the temperature at which ice goes from a solid state to a liquid state." "And they could have been forming little tiny pockets maybe only a few microns in diameter but if he can make a two or three micron diameter ball of liquid water and he has the ability to move then that bacterium is now not in a glacier but he's in an ocean." "So what are the implications of these discoveries the fact that you've got living bacteria inside ice on Earth?" "What are the implications for Europa?" "You can clearly have bacteria like this in the frozen ice near the surface crust." "And the thing that is most exciting to me is that surface crust of Europa has a wide variety of colors that are highly suggestive of microbial life and so there is a very very strong possibility that the ice of Europa may contain viable living microorganisms." "It's a controversial idea but it is a dizzying thought that the mysterious red stains on the surface of Europa could be the visible signs of alien life." "The discovery of the huge ocean of liquid water under the surface of this tiny moon combined with the potential for life in ice and the intriguing red markings that crisscross its surface have made Europa the most fascinating and important alien world we know." "A true wonder of the Solar System because it's our best hope of finding extraterrestrial life." "That question "Are we alone in the universe?"" "Is this the only planet amongst the billions of planets in our galaxy amongst the billions of galaxies in the universe that harbors life is I think one of the most important questions." "Perhaps the most important question that we can ask." "Think about what it would mean for us if the answer was that there was no other life in the Solar System in our galaxy perhaps even in the universe." "How valuable would that make planet Earth?" "How valuable would that make us?" "But then imagine that the answer is that on every moon of every planet where the conditions are right then life survives and flourishes." "Now that makes us part of a wider cosmic community the universe is teeming with life." "If knowing the answer to the question is so profoundly important then surely striving to find the answer should be of overwhelming importance." "I believe it's the most important question you can possibly ask because we have a chance of answering it." "What we've learned from the extreme places on Earth is that if there is life out there in the Solar System it will almost certainly be simple single-celled organisms like bacteria eking out an existence in the most hostile of environments." "One thing seems certain the only place in the Solar System where there is complex life life that can build a civilization is here on planet Earth." "But how did that happen?" "What is it that makes our world so special?" "Because after all everything in the Solar System shares the same genesis." "It was all created out of nothing more than a spinning cloud of gas and dust four and a half billion years ago." "Solid worlds condensed out of the swirling mists." "But those worlds were radically different." "Around the Solar System there are worlds that erupt with volcanoes of sulphur" "and others with geysers of ice." "There are worlds with rich atmospheres and swirling storms." "And there are moons carved from ice that hide huge oceans of liquid water." "But there's only one world where the laws of physics have conspired to combine all these features in one place." "On Earth the temperature and atmospheric pressure are just right to allow oceans of liquid water to exist on the surface of the planet." "And it's big enough to have retained its molten core that not only powers geysers and volcanoes" "but also produces our magnetic field that fends off the solar wind and protects our thick nurturing atmosphere." "It's the combination of all those wonders in one place that allowed life to begin and to get a foothold here on Earth." "But to allow that life to evolve into such complex creatures as ourselves requires one more ingredient." "And that's time deep time." "The kind of time over which mountains rise and fall and planets are formed and stars live and die." "And it's perhaps that that makes the Earth so rare and so precious in the cosmos because it's been stable enough for long enough for life to evolve into such magnificent complexity." "The life we have on Earth today is the result of millions of years of stability." "And the pinnacle of that is us humankind." "A species that has developed to the point where we can bend and shape and change the world around us." "We have even left our own planet behind to begin exploring our cosmic surroundings." "You could take the view that our exploration of the universe has made us somehow insignificant." "One tiny planet around one star amongst hundreds of billions." "But I don't take that view because we've discovered that it takes the rarest combination of chance and the laws of nature to produce a planet that can support a civilization that most magnificent structure that allows us to explore and understand the universe." "And that's why for me our civilization is the wonder of the Solar System." "And if you were to be looking at the Earth from outside the Solar System that much would be obvious." "We have written the evidence of our existence onto the surface of our planet." "Our civilization has become a beacon that identifies our planet as home to life."