WASP-39b, a gas giant about 700 light-years away, is turning out to be quite the exoplanetary treasure.
of carbon dioxide in the atmosphere of a planet outside the Solar System.
Since the first exoplanets were discovered in the early 1990s, we've sought to know more about these worlds orbiting alien stars. And there's something else we can tell, based on transit data. As starlight passes through the atmosphere of the transiting exoplanet, it changes. Some wavelengths on the spectrum are dimmed or brightened, depending on how molecules in the atmosphere absorb and re-emit light.
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