12 of which have diameters between one and two times Earths, and orbit in their star's habitable zone. Nine orbit stars similar to ours in size and temperature. Exoplanets, especially small Earth-size worlds, belonged within the realm of science fiction just 21 years ago.
Also Germany’s European Southern Observatory announced the discovery of a new habitable planet. The new world is just slightly bigger than Earth and sits about four light years away, orbiting Proxima Centauri. That star is the nearest one to our solar system. The planet, known as Proxima b, is close enough that future generations of space craft might be able to travel there, taking robotic probes with them. Eventually it could even be close enough to become a new home for travellers from Earth
Proxima b is far closer to its star, taking just 11.2 days to complete one orbit and sitting only 5% as far away from its star as we do from ours. But because that star is much dimmer, it is still within the habitable zone where there could be water on the planet – and, as a consequence, life.
But there are other issues with Proxima b, the star pelts its planet with powerful ultraviolet rays and X-rays, which would mean that anything living there would find it much harder and so would have to become hardened against