So I was all excited when I saw the following link while procrastinating from doing any work on the Reference Desk tonight:
Scientists discover a nearly Earth-sized planet
Swell, I thought, excited as I clicked on the link — but then the article, unsurprisingly in hindsight, brought up a pet peeve of mine and left me feeling rather cross. To wit:
Gliese 581 e sits close to the nearest star, making it too hot to support life. Still, Mayor said its discovery in a solar system 20 1/2 light years away from Earth is a “good example that we are progressing in the detection of Earth-like planets.”
Scientists also discovered that the orbit of planet Gliese 581 d, which was found in 2007, was located within the “habitable zone” — a region around a sun-like star that would allow water to be liquid on the planet’s surface, Mayor said.
This, as Xander would say, highly grates my cheese. Why do we assume that alien life forms could never evolve in uber-hot temperatures? Why do we think that life from another world is going to need water? Couldn’t a form of life evolve that needs hydrogen the way we need oxygen, or that is actually allergic to water? Has no one seen “Signs”?
All our knowledge of life comes from our own Earth’s carbon-based life forms. I’m no scientist, but as a science fictionist, it strikes me as outrageously limiting (by which I mean stupid) to assume only carbon-based life can evolve. Man, haven’t they ever read Crichton?
Malcolm sighed. … “Don’t you know about oxygen?”
“I know it’s necessary for life.”
“It is now,” Malcolm said. “But oxygen is actually a metabolic poison. It’s a corrosive gas, like fluorine, which is used to etch glass. And when oxygen was first produced as a waste product by certain plant cells — say, around three billion years ago — it created a crisis for all other life on our planet. Those plant cells were polluting the environment with a deadly poison. They were exhaling a lethal gas, and building up its concentration. A planet like Venus has less than one percent oxygen. One earth, the concentration of oxygen was going up rapidly — five, ten, eventually twenty-one percent! Earth had an atmosphere of pure poison! Incompatible with life!”
How do we know what aliens will need what we need to survive? Or what they will be made up of? We don’t know how life started on _this_ planet yet,* and yet we’ve decided that the way life works here must be how life works on other planets?? In other solar systems, in other galaxies?!
I always applaud science fiction authors who try to make their aliens break out of the mold, like Madeleine L’Engle’s “Aunt Beasts” who don’t possess the sense of sight (why we think aliens would necessarily evolve the same senses as us never made sense to me either; there are animals on THIS planet who have evolved different senses, for criminey’s sake). Or that episode of “Doctor Who,” where the Doctor realizes that the alien trying to attack them is fighting back from its home in the heart of a star. (That would be “42,” which has a _great_ name.) I often wondered if we’d even be able to _see_ aliens, or smell them, or sense them in any other way — they may have evolved in a way that leaves them undetectable to us, as rays of energy or shadows or something we can’t even fathom to imagine.
I know boo-all about biology, it’s true, and I’m sure scientists would be lining up to tell me why all this is impossible and completely incompatible with what we know about life. But we don’t know boo about life. It’s all theories, all based on our very limited observations of our own planet’s life. And we don’t even understand life here. We don’t know whether or not viruses are actually alive, and we can’t agree on the definition of a gene. We don’t understand how our own brains work yet, for cryin’ out loud.
Once we leave Earth with our observations, I imagine all bets are off.
Where we get the idea that the Earth standard for life is the Universe’s standard for life is beyond me. And I keep thinking, if we didn’t limit ourselves with such definitions, we might find what we’re looking for a little bit faster. (Not MUCH faster — we still need to make some big technological leaps, just due to the vast distances we’re talking about when it comes to these discovers — but a bit.)
And, in the meantime, these articles would stop driving my inner Trekkie fan so crazy. Which is ironic, considering 9/10ths of the Trek verse aliens consist of humans with funny foreheads — bless them.
(And, one day, I will FINALLY get my new blog set up, and post entries on these things more than once a decade …)
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* Are we still clinging to that “lightening hit a puddle of primordial goop” theory? Because, I mean, c’mon. I always thought that the Big Bang Theory is kind of a weak one, but it looks like logical genius compared to the Primordial Goop Lightening Effect Suggestion.