What volume comparison is used to describe how compact the mass of Sirius B is?
Answer
A volume roughly the size of the Earth.
The physical characteristic that defines the white dwarf Sirius B is its extreme density, stemming from compressing a significant fraction of the Sun's mass into a minimal space. This immense compaction results in Sirius B occupying a volume that is approximately the size of the Earth. To hold nearly the mass of one Sun into a volume similar to our home planet demonstrates the incredibly high density characteristic of white dwarf stars.
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