These are the places that (most likely) host alien life

Not too cold, not too hot—the conditions for life are found not just on Earth, but on a handful of other places out in the universe.

We Earthlings are a really lucky bunch. Our planet is located in just the right spot in our Solar System. We're not too close to the Sun, like Mercury or Venus, where the average temperature can reach more than 400°C. It's not too far away, either, like Jupiter or Saturn, where it can get really cold—way under 140°C.

But our planet is not the only one with such ideal conditions. A bunch of other planets and moons are also found in the so-called habitable zone or Goldilocks zone. Planets or moons located in the Goldilocks zone are at the right distance from their star so that they're not too hot and not too cold—just like Baby Bear's porridge in the fairy tale. Their overall temperature is just right for the formation of liquid water, a landmark of life.

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Credit: NASA

A comparison of the habitable zone of our solar system with the Kepler-22 system.

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Pure water in the form of ice has been discovered beneath Mar's surface.

 

Nasa announces discovery of seven planets in the TRAPPIST solar system, including three planets within the “habitable zone,” meaning they could contain water and be hosts to alien organisms.