Failed star makes world ice-cold

The OGLE-2016-BLG1195Lb planet weighs about the same as Earth and orbits only 174 million km from its star – only slightly longer than our 150 million km from the Sun. Nevertheless, a visit to the planet would not be very pleasant, as temperatures are as low as -240 °C. The planet orbits a star with only 7.8 % of the Sun's mass – an ultra- cold dwarf star. Its limited size makes astronomers believe that the star might instead be a brown dwarf rather than a star. A brown dwarf is an unsuccessful star, which has never ignited.