(QHA) - An earth-like planet has been discovered orbiting a star 700 light years, but nothing could live on its scorching surface, say scientists, The Telegraph informs. Kepler 78b is the smallest exoplanet whose mass and size are known. It is just 1.2 times bigger than Earth, 1.7 times more massive, and has an almost identical density. Scientists believe that, like the Earth, Kepler 78b mostly consists of rock and iron. There the similarities end, however as the planet hugs its parent star so closely that it is 2,000C hotter. The planet has baffled scientist, who have no idea how it got so close to its star and say that it “quite simply shouldn’t exist”. Kepler 78b's year is just 8.5 hours long – the length of time it takes to complete one orbit around its star.