An Astronomer Finds a Source of Light in Space That

An astronomer finds a source of light in space that emits light only in specific,narrow emission lines.Kirchhoff's laws lead the astronomer to which conclusion?

A) The source cannot consist of gases but rather must be a solid object.
B) The source is made up of a hot, dense gas.
C) The source is made up of a hot, low-density gas.
D) The source is made up of a hot, dense gas surrounded by a rarefied gas.

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