作者：Ashley Strickland 来源：CNN 2016-08-26 13:51
Researchers have confirmed the existence of a rocky planet named Proxima b orbiting Proxima Centauri, the closest star to our sun, according to a new study. It is the closest exoplanet to us in the universe.
Given the fact that Proxima b is within the habitable zone of its star, meaning liquid water could exist on the surface, it may also be the closest possible home for life outside of our solar system, the researchers said.
Proxima b is a mere 4.2 light-years away from our solar system, which are 92.96 million miles apart.
Proxima b is in a close orbit of Proxima Centauri: only 5% of the distance between the Earth and the sun. Proxima b has a temperature that is suitable for liquid water to exist on the surface without evaporating.
If there is life on the planet, it would be affected by this radiation.
Perhaps one of the biggest questions includes the history of the star and the planet. How did they form?
This would indicate whether the plant was rich with water in its early days or started out dry, as well as whether there was any high-energy radiation that could have blasted away an atmosphere during formation of the planet.
Many researchers hope that we can actually get an idea of their atmospheric makeup and surface composition, and strive to answer the question of "Are we alone in the universe?"