Just like Earth – but a bit hotter
A small hot planet orbiting a star 700 light years away has the same size and rocky composition as the Earth, say scientists.
Kepler 78b is the smallest exoplanet whose mass and size are known. It is just 1.2 times bigger than Earth, and 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. The planet hugs its parent star so closely that nothing could live on its scorching surface.
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