EARTH SIMILARITY INDEX

Earth – 1.00
Gliese 581g – 0.89
Gliese 581d – 0.74
Gliese 581c – 0.70
Mars – 0.70
Mercury – 0.60
HD 69830 d – 0.60
55 Cnc c – 0.56
Moon – 0.56
Gliese 581e – 0.53


PLANET HABITABILITY INDEX

Titan – 0.64
Mars – 0.59
Europa – 0.49
Gliese 581g – 0.45
Gliese 581d – 0.43
Gliese 581c – 0.41
Jupiter – 0.37
Saturn – 0.37
Venus – 0.37
Enceladus – 0.35

As Earth becomes less like itself, other places become more like Earth than Earth.

How close are these places to pre-humanity Earth?
How close are these places to post-humanity Earth?

BBC News – Most liveable alien worlds ranked.

via @jimmyl0izeau