Scientists from the European Southern
Observatory caused a stir this week when they announced the discovery of a
planet circling the nearest star to Earth’s own Sol. And not just any old
planet, either, but one situated in the so-called “Goldilocks” zone, close
enough to the star Proxima to be capable of sustaining liquid water on its
surface. The planet, dubbed “Proxima b,” is thought to be rocky and just
slightly larger than our own Earth, both conditions that might lead us to think
it capable of providing an environment conducive to life.
The Proxima system is the closest solar
system to Earth at 4.23 light years. So to find a possibly habitable planet in
that system is enough to have heads spinning both in the scientific community and among those whose business
it is to mix science and fiction. Another Earth! And practically on our cosmic doorstep!
Artist's rendition of the surface of Proxima b. |
Yet for those without much imagination,
Proxima b is likely to be something of a disappointment. The planet orbits a
red dwarf star, which gives off little heat and not much visible light. And,
even though the position of the planet in close orbit compensates in some ways for
the low energy output of its star, photosynthesis as we currently know it would
not be possible.
Then poor Proxima b is
locked in a permanent one-sided relationship with its sun. That is, one
hemisphere of the planet is always facing the star (and is thus constantly blasted
with heat and radiation), while one hemisphere is always faced away (freezing
and desolate). Solar flares and other hazards of the planet’s location close to
the unstable red dwarf would make survival on the “day” side dicey. No access
to heat or light on the “night” side would make it impossible. Life as we know
it could only develop in the twilight zones between the two hemispheres.
Vision for whatever creatures do manage to
emerge on Proxima b would be quite different from ours, tuned to the longer
wavelengths of the infrared, rather than the shorter ultra-violet rays created
by a yellow sun at the peak of its life cycle. They would also be used to a
very quick “year” (eleven of our days to make an orbit around Proxima) and no “days”
to speak of.
Now a writer with imagination could make a
lot of those significant differences from our Earth. I can’t wait to read the
first stories about invasion, uh, contact with the aliens from Proxima b.
Information for this post drawn from: Forbes Magazine, "Starts With a Bang" blog, Ethan Siegle, Contributor, September 6,2016
Cheers,
Donna
Information for this post drawn from: Forbes Magazine, "Starts With a Bang" blog, Ethan Siegle, Contributor, September 6,2016
Cheers,
Donna
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