Only if that pressure is high enough could liquid water exist on a planet's surface.
Probably the most exciting announcement in astronomy during 2010 was the reported discovery of a planet orbiting a relatively nearby star in its "habitable" zone, a region where liquid water could exist on a planet's surface.
Many of these planets are unlike those seen in the solar system, and a few orbit within their star's habitable zones, the orbital space where liquid water (and thus possibly life) could survive on a planet's surface.
Because of its low luminosity, a red dwarf's habitable zone (the region near a star where liquid water could be found on a planet's surface) is very close to the star.
Its orbital period of 11.2 days puts it within Proxima's habitable zone, at the distance from the star where water can exist in liquid form on a planet's surface.
The Kepler satellite in 2011 came closer to its goal of finding an Earth-size planet in another star's habitable zone (the region where liquid water could survive on a planet's surface) when it found the first Earth-size planets, Kepler-20e and Kepler-20f, which are 0.87 and 1.03 times the radius of Earth, respectively.
No Man's Sky also significantly limits your travel capabilities when on a planet's surface: You do a lot of walking.
According to Fressin, "it's still too early to say how many Earth-sized planets orbit their parent star in the so-called habitable zone," where balmy temperatures allow the existence of liquid water on a planet's surface.
The researchers found that when gas giants migrate, they fling lots of rocky debris away from the star and into the habitable zone, where liquid water can exist on a planet's surface.
In the infographic above, you can see the area highlighted in green, which marks the Goldilocks Zone where liquid water could exist on a planet's surface (an important ingredient to support life).
