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World Space Week has prompted myself and colleagues at the Open University to discuss the question: ‘Is there life beyond Earth?’
The bottom line is that we are now certain that there are many places in our Solar System and around other stars where simple microbial life could exist, of kinds that we know from various settings, both mundane and exotic, on Earth. What we don’t know is whether any life does exist in any of those places. Until we find another example, life on Earth could be just an extremely rare fluke. It could be the only life in the whole Universe. That would be a very sobering thought.
At the other extreme, it could be that life pops up pretty much everywhere that it can, so there should be microbes everywhere. If that is the case, then surely evolutionary pressures would often lead towards multicellular life and then to intelligent life. But if that is correct – then where is everybody? Why can’t we recognise the signs of great works of astroengineering by more ancient and advanced aliens? Why can’t we pick up their signals?
The chemicals from which life can be made are available all over the place. Comets, for example, contain a wide variety of organic molecules. They aren’t likely places to find life, but collisions of comets onto planets and their moons should certainly have seeded all the habitable places with the materials from which life could start.
So where might we find life in our Solar System? Most people think of Mars, and it is certainly well worth looking there. The trouble is that lumps of rock knocked off Mars by asteroid impacts have been found on Earth. It won’t have been one-way traffic. Asteroid impacts on Earth must have showered some bits of Earth-rock onto Mars. Microbes inside a rock could survive a journey in space, and so if we do find life on Mars it will be important to establish whether or not it is related to Earth-life. Only if we find evidence of an independent genesis of life on another body in our Solar System will we be able to conclude that the probability of life starting, given the right conditions, is high.
A colour image of comet 67/P from Rosetta’s OSIRIS camera. Part of the ‘body’ of the comet is in the foreground. The ‘head’ is in the background, and the landing site where the Philae lander will arrive on 12 November 2014 is out of view on the far side of the ‘head’. (Patrik Tschudin, CC-BY-2.0 via Flickr)
For my money, Mars is not the most likely place to find life anyway. The surface environment is very harsh. The best we might hope for is some slowly-metabolising rock-eating microbes inside the rock. For a more complex ecosystem, we need to look inside oceans. There is almost certainly liquid water below the icy crust of several of the moons of the giant planets – especially Europa (a moon of Jupiter) and Enceladus (a moon of Saturn). These are warm inside because of tidal heating, and the way-sub-zero surface and lack of any atmosphere are irrelevant. Moreover, there is evidence that life on Earth began at ‘hydrothermal vents’ on the ocean floor, where hot, chemically-rich, water seeps or gushes out. Microbes feed on that chemical energy, and more complex organisms graze on the microbes. No sunlight, and no plants are involved. Similar vents seem pretty likely inside these moons – so we have the right chemicals and the right conditions to start life – and to support a complex ecosystem. If there turns out to be no life under Europa’s ice them I think the odds of life being abundant around other stars will lengthen considerably.
We think that Europa’s ice is mostly more than 10 km thick, so establishing whether or not there is life down there wont be easy. Sometimes the surface cracks apart and slush is squeezed out to form ridges, and these may be the best target for a lander, which might find fossils entombed in the slush.
Enceladus is smaller and may not have such a rich ocean, but comes with the big advantage of spraying samples of its ocean into space though cracks near its south pole (similar plumes have been suspected at Europa, but not proven). A properly equipped spaceprobe could fly through Enceladus’s eruption plumes and look for chemical or isotopic traces of life without needing to land.
If you share my jealousy of Peter Capaldi and his new guise as the Doctor, then read on to discover how you could become the next Time Lord with a fondness for Earth. However, be warned: you can’t just pick up Matt Smith’s bow-tie from the floor, don Tom Baker’s scarf, and expect to save planet Earth every Saturday at peak viewing time. You’re going to need training. This is where Oxford’s online products can help you. Think of us as your very own Companion guiding you through the dimensions of time, only with a bit more sass. So jump aboard (yes it’s bigger on the inside), press that button over there, pull that lever thingy, and let’s journey through the five things you need to know to become the Doctor.
(1) Regeneration
Being called two-faced may not initially appeal to you. How about twelve-faced? No wait, don’t leave, come back! Part of the appeal of the Doctor is his ability to regenerate and assume many faces. Perhaps the most striking example of regeneration we have on our planet is the Hydra fish which is able to completely re-grow a severed head. Even more striking is its ability to grow more than one head if a small incision is made on its body. I don’t think it’s likely the BBC will commission a Doctor with two heads though so best to not go down that route. Another example of an animal capable of regeneration is Porifera, the sponges commonly seen on rocks under water. These sponge-type creatures are able to regenerate an entire limb which is certainly impressive but are not quite as attractive as The David Tenants or Matt Smiths of this world.
Sea sponges, by Dimitris Siskopoulos. CC-BY-SA-2.0 via Flickr.
(2) Fighting aliens
Although alien invasion narratives only crossed over to mainstream fiction after World War II, the Doctor has been fighting off alien invasions since the Dalek War and the subsequent destruction of Gallifrey. Alien invasion narratives are tied together by one salient issue: conquer or be conquered. Whether you are battling Weeping Angels or Cybermen, you must first make sure what you are battling is indeed an alien. Yes, that lady you meet every day at the bus-stop with the strange smell may appear to be from another dimension but it’s always better to be sure before you whip out your sonic screwdriver.
(3) Visiting unknown galaxies
The Hubble Ultra Deep Field telescope captures a patch of sky that represents one thirteen-millionth of the area of the whole sky we see from Earth, and this tiny patch of the Universe contains over 10,000 galaxies. One thirteen-millionth of the sky is the equivalent to holding a grain of sand at arm’s length whilst looking up at the sky. When we look at a galaxy ten billion light years away, we are actually only seeing it by the light that left it ten billion years ago. Therefore, telescopes are akin to time machines.
The sheer vastness and mystery of the universe has baffled us for centuries. Doctor Who acts as a gatekeeper to the unknown, helping us imagine fantastical creatures such as the Daleks, all from the comfort of our living rooms.
The majority of time-travel narratives avoid the use of a physical time-machine. However, the Tardis, a blue police telephone box, journeys through time dimensions and is as important to the plot of Doctor Who as upgrades are to Cybermen. Although it looks like a plain old police telephone box, it has been known to withstand meteorite bombardment, shield itself from laser gun fire and traverse the time vortex all in one episode. The Tardis’s most striking characteristic, that it is “much bigger on the inside”, is explained by the Fourth Doctor, Tom Baker, by using the analogy of the tesseract.
(5) Looking good
It’s all very well saving the Universe every week but what use is that without a signature look? Tom Baker had the scarf, Peter Davison had the pin-stripes, John Hurt even had the brooding frown, so what will your dress-sense say about you? Perhaps you could be the Doctor with a cravat or the time-traveller with a toupee? Whatever your choice, I’m sure you’ll pull it off, you handsome devil you.
Don’t forget a good sense of humour to compliment your dashing visage. When Doctor Who was created by Donald Wilson and C.E. Webber in November 1963, the target audience of the show was eight-to-thirteen-year-olds watching as part of a family group on Saturday afternoons. In 2014, it has a worldwide general audience of all ages, claiming over 77 million viewers in the UK, Australia, and the United States. This is largely due to the Doctor’s quick quips and mix of adult and childish humour.
You’ve done it! You’ve conquered the cybermen, exterminated the daleks, and saved Earth (we’re eternally grateful of course). Why not take the Tardis for another spin and adventure through more of Oxford’s online products?
Image credit: Doctor Who poster, by Doctor Who Spoilers. CC-BY-SA-2.0 via Flickr.
From seeing the stars to taking a tour of the moon, The Klutz Guide to the Galaxy is an educational, entertaining, intergalactic treat. The book comes with 6 tools, including a build-it-yourself telescope and a no-batteries-required sundial, to help kids ages 8 and up navigate their way through outer space. The design and layout is kid-friendly, making it easy for galactic explorers to digest information and ponder some of the greatest scientific discoveries of our universe, right from their backyards.
Is it possible you have a young galactic explorer at your house? If so, reach for the stars and enter to win one of two copies of The Klutz Guide to the Galaxy. Giveaway begins April 25, 2011, at 12:01 A.M. PST and ends May 23, 2011, at 11:59 P.M. PST.
Reading Level: 8 and up
Paperback: 67 pages
Book overview: THE KLUTZ GUIDE TO THE GALAXY by Pat Murphy and the Scientists of Klutz Labs
Isn’t it time you discovered your place in the galaxy?
Explore the universe without leaving the comfort of your backyard. When the scientists at Klutz Labs tackle outer space, we not only ask questions like “Where’s the Big Dipper” but also “If I lived on planet Mercury, am I already old enough to drive?” Use the included telescope, red light for night use, sundial, and astrolab to start exploring our great galaxy.
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Maximum entries: Three (3)
Giveaway Rules:
Shipping Guidelines: This book giveaway is open to participants with a United States or Canadian address.
Giveaway begins April 25, 2011, at 12:01 A.M. PST and ends May 23, 2011, at 11:59 P.M. PST, when all entries must be received. No purchase necessary. See official rules for details. View our privacy policy.
