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In January 2006, astronomers reported the discovery of a planet comparable in size to the earth orbiting another star and having a mass of about 5.5 times the earths mass. It is believed to consist of a mixture of rock and ice, similar to Neptune. Take mEarth=5.971024 kg and rEarth=6.38 106 m.
If this planet has the same density as Neptune
What is its radius expressed as a multiple of earths radius?
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