`Tens of billions` of habitable worlds in Milky Way
London: Astronomers hunting for rocky planets with the right temperature to support life estimate there may be tens of billions of them in our galaxy alone.
A European team said on Wednesday that about 40 percent of red dwarf stars - the most common type in the Milky Way - have a so-called "super-Earth" planet orbiting in a habitable zone that would allow water to flow on the surface.
Since there are around 160 billion red dwarfs in the Milky Way, the number of worlds that are potentially warm enough and wet enough to support life is enormous.
Xavier Bonfils of the Institute of Planetology and Astrophysics in Grenoble, the leader of the team, said the 40 percent figure was at the high end of what had been expected and the finding underscored the prevalence of small rocky planets.
His team is the first to calculate the number of super-Earths - planets with a mass between one and 10 times the Earth - in such habitable zones, although previous research has found the Milky Way to be awash with planets.
Red dwarfs, which are faint and cool compared to the Sun, account for around 80 percent of the stars in the Milky Way.
After studying 102 of these stars in the southern skies using a European Southern Observatory telescope in Chile, Bonfils and colleagues found rocky planets were far more common than massive gas giants like Jupiter and Saturn in our solar system.
However, the rocky worlds spinning around red dwarfs are not necessarily cosy places for alien forms of life.
Because reds dwarfs are much cooler than the sun, any planets with liquid water will need to be orbiting much closer to the star than the Earth is from the Sun. That may mean they are bathed in damaging X-ray and ultraviolet radiation.
Scientists aim to take a closer look at some of the Earth-like planets as they pass in front of nearby red dwarfs, which should yield information about their atmospheres and help in the search for possible signs of life.
The research was presented in a paper to be published in the journal Astronomy & Astrophysics.
More from India
More from World
More from Sports
More from Entertaiment
- China condemns Pakistan over Uri terror attack
- Indian- Americans launch online petition to declare Pakistan 'sponsor of terrorism'
- DNA: Analysis over who is responsible for tense condition of Kashmir after Burhan Wani's death?
- Should Pakistani artists be restricted from working in India?
- EU warns Pakistan of political and economic sanctions over atrocities in Baloch
- Onam Bumper Lottery/Kerala Thiruvonam Bumper-2016 BR-51 draw result declared - Here is the winning ticket number
- Uri attack: Israel ready to help India with cutting-edge technology to secure borders
- India's Rafale vs Pakistan's F-16: Why the French fighter jet is the best choice for dogfight
- MNS ultimatum to Pakistani actors: Leave India in 48-hour deadline
- All you need to know about Reliance JioFi at Rs 1,999 – use free data till December 31