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staedtler staedtler
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7 years ago
A brown dwarf star is

(a)   a low-mass star that never achieves thermonuclear fusion in its core.
(b)   a white dwarf star that has cooled to a low temperature over its long lifetime.
(c)   the core of a red giant star, revealed when the outer layers are shed during the planetary nebula phase.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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