An animation of the Three of the planets around Gliese 667C orbit within its habitable zone (in green). Credit: Guillem Anglada-Escude
An animation of the Three of the planets around Gliese 667C orbit within its habitable zone (in green) where a planet with Earth-like conditions would be habitable. The red and blue bands indicate the hot and cold edges of such habitable zone. In them a planet might still be able to support liquid water on its surface if more exotic atmospheric compositions are allowed. Two of the planet candidates lie within this extended definition of the habitable zone. Credit: Guillem Anglada-Escude