How do astronomers study sun oscillations?
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Astronomers discovered that the Sun pulsates—that is, it alternately expands and contracts—just as your chest expands and contracts as you breathe. This pulsation is very slight, but it can be detected by measuring the radial velocity of the solar surface—the speed with which it moves toward or away from us.
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Different oscillation modes of pulsating stars penetrate to different depths inside the star. The observed frequency spectra are carefully characterized rendering information on the stellar interior.
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