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Meteors, Asteroids and Comets
This diagram illustrates how astronomers can capture the elusive spectra of hot-Jupiter planets. To capture a spectrum of the planet, the telescope must observe the system twice. It takes a spectrum of the star together with the planet(first panel), then, as the planet disappears from view, a spectrum of just the star(second panel). By subtracting the star's spectrum from the combined spectrum of the star plus the planet, it is able to get the spectrum for just the planet (third panel).
Credit: NASA/JPL-Caltech


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