Spectrum of a Blue Giant vs. Spectrum of a White Dwarf
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NASA/ESA/CSA/STScI
Differences in the width and clarity of absorption lines of stars can indicate differences in density. The absorption lines of a white dwarf are much broader than those of a blue giant. A white dwarf can be 100,000,000 times denser than a blue giant.
Credits
Illustration
NASA, ESA, Leah Hustak (STScI)