Astronomers use transit spectroscopy to analyze exoplanet atmospheres. When a planet passes in front of its star, some of the star's light passes through the planet's atmosphere. The atmosphere absorbs specific wavelengths, allowing scientists to detect molecules. What is one limitation of using spectral analysis for detecting exoplanet atmospheres?
Answer
A
It requires the exoplanet to pass in front of its star relative to Earth.
B
It works only for exoplanets within our solar system.
C
It can only detect planets that emit their own light.
D
It does not provide any information about atmospheric composition.
Explanation
Transit spectroscopy measures starlight filtered through a planet’s atmosphere while the planet crosses in front of its star. A limitation is that this method requires the planet’s orbit to be aligned so the transit is visible from Earth. It can reveal atmospheric composition, so D is incorrect; it is not limited to planets in our solar system or to planets that emit their own light.
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