Science
News reports the discovery of a second mega earth. This
is an apparently rocky planet many times more massive than our own.
Could this then be a Krypton-type planet with greater gravity where
if two-legged folk evolved, and they could somehow get to earth, they
could jump further than mere earth people and travel faster than a speeding bullet?
Sixteen times as
heavy as earth, massive BD+20594b should be a gas giant like
Neptune or Uranus. But instead it's 100% rock. The planet orbits
its star in 42 days. A little online research indicates the star
itself is very slightly smaller and cooler than the sun and also
about one billion years younger. This makes it a yellow star as
is our sun, i.e., not red.
Judging from the
planet's orbital period, it is even closer to its sun than is Mercury
to ours. This probably means it's too hot for life as we know it.
It also seems too
massive for plate tectonics to exist. Scientists suggest that
plate tectonics is key to the circulation of carbon which is the
basis for life on earth. Without moving continents and circulation
between core, mantle and crust, everything remains locked in place.
Now, if the planet
might be tidally locked to its star – one side always facing toward
and the other away – there might be a transitional zone between -- in
perpetual twilight -- where the temperature might be more conducive to
life. And in twilight, at sunset, that sun might appear red. Tidal
forces might also create enough internal tension to stimulate
circulation within the rocky layers. So, perhaps the possibility of
finding Superman's home planet cannot be completely discounted.
What is clear is
that recent discoveries of exoplanets make a strong case for
the existence of a wide range of planet types including
ones that might support life. We also should not limit our consideration to forms of life based on carbon or water such as ours. Might someone be sailing methane seas on Titan? Is anyone
out there?
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