According to media reports, NASA astronauts might have found the first-ever planet outside of our own Milky Way galaxy. So far, scientists have found out 5,000 “exoplanets” which are worlds orbiting stars beyond our Sun. These exoplanets are the planets outside of our solar system that normally orbits a star other than our own sun in our galaxy.
Scientists believe that the newly found exoplanets would be about 28 million light-years away that is, thousands of times farther away than those in the Milky Way.
The planet is about the size of a Saturn and is discovered by Nasa’s Chandra X-Ray Telescope is in the Messier 51 galaxy. Nasa’s Chandra X-ray Observatory is a flagship-class space telescope that is specially designed to detect X-ray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes.
The study on planets instead looked for the dips in the brightness of X-rays as planets passed in front. The X-rays come from X-ray bright binaries, which usually include a neutron star or a black hole that pulls in gas from another star nearby – as they do, the heat up the material and the glow can be seen in X-rays.
Rosanne Di Stefano from the Centre for Astrophysics led the study and was published today in Nature Astronomy. Nasa said that X-ray transit they found using Chandra data lasted about three hours, during which the X-ray emission decreased to zero. Based on this and other information, the researchers estimate the exoplanet candidate in M51-ULS-1 would be roughly the size of Saturn. This contains a black hole orbiting a companion star with a mass about 20 times that of the Sun.
NASA also waiting to pinpoint thousands more previously unknown worlds, perhaps hundreds of them Earth-sized or ”super-Earth” sized which will not be any larger than or twice as big as our home planet.