A 'habitable' earth-like planet, which is orbiting around a sun-like star 600 light years away, has been discovered in our galaxy for the first time, researchers say.
A team of researchers from NASA's Kepler Mission has discovered what could be a large, rocky planet with a surface temperature of about 72 degrees Fahrenheit, comparable to a comfortable spring day on earth.
The discovery team, led by William Borucki of the NASA Ames Research Centre, used photometric data from the NASA Kepler space telescope, which monitors the brightness of 155,000 stars.
Earth-size planets whose orbital planes are aligned such that they periodically pass in front of their stars result in tiny dimmings of their host star's light dimmings that can only be measured by a highly specialized space telescope like Kepler.
The host star lies about 600 light-years away from us toward the constellations of Lyra and Cygnus.
The star, a G5 star, has a mass and a radius only slightly smaller than that of our sun, a G2 star. As a result, the host star is about 25 per cent less luminous than the sun.
This new exoplanet is the smallest-radius planet discovered in the habitable zone of any star to date. It is about 2.4 times larger than that of the earth, putting it in the class of exoplanets known as super-earths.
"This discovery supports the growing belief that we live in a universe crowded with life," Carnegie's Alan Boss said.
"Kepler is on the verge of determining the actual abundance of habitable, Earth-like planets in our galaxy," Boss added.
The study will be published in the Astrophysical Journal.
No comments:
Post a Comment