An image shows an artist’s impression of a view of the surface of the planet Proxima b orbiting the red dwarf star Proxima Centauri.
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A team including CNRS astrophysicists have calculated the size and surface properties of the planet dubbed Proxima b, and concluded it may be an "ocean planet" similar to Earth.It is estimated to have a mass about 1.3 times that of Earth, and orbits about 7.5 million kilometers from its star – about a tenth the distance of innermost planet Mercury from the Sun.Assuming a minimum radius of 5,990 km, the planet would be very dense, with a metallic core making up two-thirds of the entire planet's mass, surrounded by a rocky mantle.If there is surface water, it would not contribute more than 0.05 percent to the planet's total mass, the team said – similar to Earth, where it is about 0.02 percent.
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