Astronomers have discovered a frozen planet with a mass over three times that of the Earth, orbiting the closest solitary star to the Sun. The rocky planet, known as Barnard's star b, is a 'super-Earth' and orbits around its host star once every 233 days. The findings show the planet lies at a distant region from the star known as the 'snow line'. The planet's surface temperature is estimated to be around minus 170 degrees Celsius, meaning it is likely to be a frozen world which is uninviting to Earth-like life. The temperature could be higher and conditions potentially more hospitable, if the planet has a substantial atmosphere. Among astronomers and exoplanet scientists Barnard's star is an infamous object, as it was one of the first stars where planets were initially claimed but later proven to be incorrect. Hopefully we got it right this time. Barnard's star is the next closest star to the Sun after the Alpha Centauri triple system at nearly six light-years away. It is a type of faint, low-mass star called a red dwarf. To look for exoplanet candidates Red dwarfs are considered to be the best places. Barnard's star b is the second closest known exoplanet to our Sun. The closest lies just over four light-years from Earth That exoplanet, called Proxima b, orbits around the red dwarf star Proxima Centauri. During the observations that led to the discovery of Barnard's star b the researchers used the radial velocity method. Wobbles in a star is detected by this technique which are likely to be caused by the gravitational pull of an orbiting planet. These wobbles affect the light coming from the star. Spectrum appears slightly shifted towards the blue and, as it moves away, it is shifted towards the red as the star moves towards the Earth. This technique has been used for the first time to detect a planet this small so far away from its host star.