Out of 29 known rocky planets in the habitable zone, the authors find only five to be consistently in the PHZ for all likely variables; Kepler-452 b, Kepler-1638 b, Kepler-1544 b, and Kepler-62 e ...

Earth sits perfectly in that zone. Venus and Mars sit right outside of the habitable zone. Venus is too close to the sun so it’s too hot for liquid water to exist. Any water would simply evaporate.

Researchers have figured out how probable it is for stars in the Milky Way to have planets in the habitable zone, where liquid water could be present, and the result is pretty astounding.

The outer planet is the super-Earth HD 20794 d, and the green region in space is this solar system's habitable zone. An illustration of a habitable zone in a solar system. Credit: NASA ...

Just 39 light-years away, the Trappist-1 system hosts seven Earth-sized planets orbiting a dim red dwarf star,three of which lie within the habitable zone. These alien worlds may harbor the ...

In the context of our solar system, Mars — on the outer edge of our habitable zone — orbits our sun at an average distance of 1.5 astronomical units (228 million km/141 million miles), while ...