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Interstellar space (the space between the stars) is filled with extremely low-density hydrogen gas. ...

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Interstellar space (the space between the stars) is filled with extremely low-density hydrogen gas. ...

Interstellar space (the space between the stars) is filled with extremely low-density hydrogen gas. In the vicinity of a hot star, this gas can be heated to a very high temperature. This hot, low-density gas will
A)   emit light at specific wavelengths characteristic of hydrogen.
B)   emit light at all wavelengths in a blackbody spectrum, with emission lines characteristic of hydrogen superimposed on this spectrum.
C)   emit light at all wavelengths, in a blackbody spectrum characteristic of a hot gas.
D)   reflect light at specific wavelengths characteristic of hydrogen.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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