Astronomers Find 7 Earth-Size Planets Where Life Is Possible
Astronomers have found a nearby solar system with seven Earth-sized planets, three of which circle their parent star at the right distance for liquid surface water, bolstering the prospect of discovering extra-terrestrial life, research published on Wednesday showed.
The star, known as TRAPPIST-1, is a small, dim celestial body in the constellation Aquarius. It is located about 40 light years away from Earth, close by astronomical standards, but about 44 million years away at the average cruising speed of a commercial passenger jet.
Researchers said the proximity of the system, combined with the proportionally large size of its planets compared to the small star, make it a good target for follow-up studies. They hope to scan the planets’ atmospheres for possible chemical fingerprints of life.
“The discovery gives us a hint that finding a second Earth is not just a matter of if, but when,” Nasa chief scientist Thomas Zurbuchen said at a news conference on Wednesday.
This is the first time that so many Earth-sized planets are found around the same star,” lead researcher Michael Gillon, with the University of Liege in Belgium, told reporters.