The atmosphere of the gas-giant planet HD 209458b is believed to contain hydrogen,sodium,oxygen,carbon,and carbon monoxide.Where does this information come from?
A) All known gas giants contain these molecules, so it is assumed that this one does also.
B) Light shines through the planet's atmosphere when it passes in front of its star, so a spectrum can be taken.
C) As the planet orbits its star, it leaves a trail of atmosphere behind. This can be analyzed spectroscopically.
D) Gas giants always have the same composition as their stars, and we have measured the spectrum of HD 209458.
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