" From the exoplanet data, astronomers can now say with confidence that one out of every five stars hosts a world where life as we know it could form.

So, when you’re standing out there under the night sky, choose five random stars.

Chances are, one of them has a world in its Goldilocks zone where liquid water could be flowing across its surface and life might already exist. "

― Adam Frank , Light of the Stars: Alien Worlds and the Fate of the Earth