Scientists discovered a new planet called Kepler 78b which has a similar mass and density to that of Earth. It orbits a star 400 light years away. Kepler78b is composed mostly of rock and iron, very similar to our own planet. It is extremely close to its host star which is a hundredth of the distance between the Earth and the Sun.
But the temperature on Kepler 78b ranges from 2000 C to 2800 C in daytime which is far too hot to support any form of life.
The newly discovered planet belongs to a new class of ultrashort period planets. These planets complete one circuit of their host star in less than 12 hours.
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