Kim Philby
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PARIS: An international team of scientists on Monday said that they have discovered a trio of Earth-like planets that are by far the best bet to find life outside our solar system.
The three planets orbit an ultracool dwarf star a mere 39 light years away, and are comparable in size and temperature to Earth and Venus, they reported in a study published in the journal 'Nature'.
"This is the first opportunity to find chemical traces of life outside our solar system," said lead author Michael Gillon, an astrophysicist at the University of Liege in Belgium. All three planets had the "winning combination" of being similar in size to Earth, "potentially habitable" and close enough so their atmospheres can be analysed with current technology, he added.
The find opens up a whole new "hunting ground" for habitable planets.
Gillon and colleagues calibrated a 60-centimetre telescope in Chile, known as TRAPPIST, to track several dozen dwarf stars that are neither big nor hot enough to be visible with optical telescopes.
They zeroed in on a particularly promising one — now known as TRAPPIST-1 — about one eighth the size of the Sun, and significantly cooler.
Observing it for months, the astronomers noticed that its infrared signal faded slightly at regular intervals, which is evidence of objects in orbit.
Further analysis confirmed that they were exoplanets — planets revolving around stars outside our solar system.
The innermost two circle their dwarf star every 1.5 and 2.4 days, though they are hit with only four and two times the amount of heat-generating radiation that Earth receives from the Sun.
http://timesofindia.indiatimes.com/...y-habitable-planets/articleshow/52080240.cms?
The three planets orbit an ultracool dwarf star a mere 39 light years away, and are comparable in size and temperature to Earth and Venus, they reported in a study published in the journal 'Nature'.
"This is the first opportunity to find chemical traces of life outside our solar system," said lead author Michael Gillon, an astrophysicist at the University of Liege in Belgium. All three planets had the "winning combination" of being similar in size to Earth, "potentially habitable" and close enough so their atmospheres can be analysed with current technology, he added.
The find opens up a whole new "hunting ground" for habitable planets.
Gillon and colleagues calibrated a 60-centimetre telescope in Chile, known as TRAPPIST, to track several dozen dwarf stars that are neither big nor hot enough to be visible with optical telescopes.
They zeroed in on a particularly promising one — now known as TRAPPIST-1 — about one eighth the size of the Sun, and significantly cooler.
Observing it for months, the astronomers noticed that its infrared signal faded slightly at regular intervals, which is evidence of objects in orbit.
Further analysis confirmed that they were exoplanets — planets revolving around stars outside our solar system.
The innermost two circle their dwarf star every 1.5 and 2.4 days, though they are hit with only four and two times the amount of heat-generating radiation that Earth receives from the Sun.
http://timesofindia.indiatimes.com/...y-habitable-planets/articleshow/52080240.cms?
