Trappist-1: the system with Earth’s seven sisters.
NASA Scientists have just announced the discovery of a new planetary system beyond the solar system. Since the discovery of the first one in 1995, astronomers have found more than 3500 planets out the solar system.
However, the discovery that Michael Gillon and his team announced today is a very special one. Trappist-1 is a system with at least 7 earth-sized planets orbiting nearby an Ultra-Cool Dwarf Star.
In addition, three of them are in a zone that scientists define “habitable zone”. Therefore, we have three possible candidates in Trappist-1.
But, what is that makes a planet a habitable world?
In order to be habitable, a planet needs to be at the right distance from its star, with the right mass and atmosphere. Moreover, it needs the right amount of liquid water on its surface. Thomas Zurbuchen, associate administrator of the Science Mission Directorate at NASA Headquarters in Washington, said:“The discovery gives us a hint that finding a second earth is not just a matter of if but when”. So, the journey has just begun!
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