In what can be termed as a significant addition to the field of science, an international team of scientists claim that they have discovered three ‘potentially habitable’ planets.
Scientists further say that they are the best planets found so far when it comes to finding life outside our solar system.
The three orbit an ultracool dwarf star a mere 39 light years away, and are likely comparable in size and temperature to Earth and Venus, they reported in a study, published in 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 told AFP.
The find opens up a whole new “hunting ground” for habitable planets, he added.
Gillon and colleagues calibrated a 60-centimetre telescope in Chile, known as TRAPPIST, to track several dozen dwarf stars 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, evidence of objects in orbit.
Further analysis confirmed they were exoplanets – planets revolving around stars outside our solar system.