New ‘Life in Space’ Hope After Billions of ‘Habitable Planets’ Found in Milky Way
Billions of potentially habitable planets may exist within our galaxy, the Milky Way, raising new prospects that life could exist near Earth, a study has found.
Researchers discovered that at least 100 of the ”super-Earths” may be on our galactic doorstep, at distances of less than 30 light years, or about 180 trillion miles, from the sun.
Astronomers say the findings were made after conducting a survey of red dwarf stars, which account for about four in five stars in the Milky Way.
They calculate that around 40 per cent of red dwarfs have a rocky planet not much bigger than Earth orbiting the ”habitable zone”, in which liquid surface water can exist.
Scientists say that where there is water, there also could be life although they add that being in the habitable zone is no guarantee that life has evolved on a planet.
Dr Xavier Bonfils, from Grenoble University in France, who led the international team, said: ”Because red dwarfs are so common - there are about 160 billion of them in the Milky Way - this leads us to the astonishing result that there are tens of billions of these planets in our galaxy alone.”
In their study, the team of astronomers surveyed a carefully chosen sample of 102 red dwarfs using the European Southern Observatory’s 3.6-metre telescope at La Silla, Chile.
A total of nine super-Earths - planets with masses between one and 10 times that of Earth - were found. Two were located within the habitable zones of the stars Gliese 581 and Gliese 667 C.
These data were combined with other observations, including those of stars which did not have planets.