Start your bidding now. Via NatGeo News:
The alien planet Gliese 581g set off a firestorm of controversy earlier this year when astronomers loudly declared it to be the first truly habitable planet found outside our solar system.
One of several planets known to orbit the red dwarf star Gliese 581, the headline-grabbing world was described by one researcher as being “just the right size and just at the right distance [from its star] to have liquid water on the surface.”
Not so fast, other astronomers cried. Are you sure this planet actually exists?
Even at a mere 20 light-years from Earth, Gliese 581g is too far away for us to see it directly. We have to infer its existence based on the planet’s gravitational tugs on its host star.
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