Top Definition
The only planet we know of outside of Earth that is is the habitable or 'goldilocks' zone, which means that if atmospheric and surface conditions are good enough, there's a good chance we've found aliens.
Nerd: Dude, have you heard of Gliese 581 G?

Neurotypical: No. No I haven't.
by fishtacodelux February 10, 2011

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