Within what limits do: a) distances to stars vary; b) the size of the stars; c) their masses; d) density?

a) the distances to the stars vary over a very wide range; b) the sizes of stars vary from 20 km (neutron stars) to several astronomical units; c) the masses of the stars – 0.01M. <M <100M d) density of stars – from 10 ^ -3 kg / m3 to 10 ^ 18 kg / m3.

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