7 Earth-size worlds found orbiting star; could hold life - washingtonpost
CAPE CANAVERAL, Fla. — For the first time, astronomers have discovered seven Earth-size planets orbiting a single nearby star — and these new worlds could hold life.
This cluster of planets is less than 40 light-years away in the constellation Aquarius, according to NASA and the Belgian-led research team who announced the discovery Wednesday.
The planets circle tightly around a dim dwarf star called Trappist-1, barely the size of Jupiter. Three are in the so-called habitable zone, the area around a star where water and, possibly life, might exist. The others are right on the doorstep.
Scientists said they need to study the atmospheres before determining whether these rocky, terrestrial planets could support some sort of life. But it already shows just how many Earth-size planets could be out there — especially in a star’s sweet spot, ripe for extraterrestrial life. The more planets like this, the greater the potential of finding one that’s truly habitable. Until now, only two or three Earth-size planets had been spotted around a star. A rocky Earth-sized world inside a star’s habitable zone is considered the best candidate for finding evidence of life.
“We’ve made a crucial step toward finding if there is life out there,” said the University of Cambridge’s Amaury Triaud, one of the researchers. - Read More