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It can be shown that the radius of a white dwarf can be determined from its mass. The more massive a white dwarf is, the smaller its radius will be (since a more massive star has a higher gravity and is therefore compressed to a smaller size).
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In general, most White Dwarf stars have masses of about 0.6 solar masses and are about the size of the Earth.
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(Source:
http://www.astro.umd.edu/education/a...ev/wdwarf.html)
Those two statements prove that anything more than 0.6 solar masses (Melusine said ALMOST, so we can assume that it is between 0.6 and 1) would have a radius that is less than Earth's. So I guess that voids this question?
with regards
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