How do astronomers know what Pluto is made of from so far away?
Quick Answer
They analyze reflected sunlight with spectroscopy, which reveals Pluto’s surface ices such as nitrogen, methane, and carbon monoxide.
The Full Story
Even from billions of kilometers away, light carries chemical clues. When sunlight reflects off Pluto, its spectrum shows absorption patterns that indicate which materials are present on the surface. Spacecraft data from NASA’s New Horizons flyby in 2015 confirmed that Pluto has a mix of ices, including nitrogen, methane, and carbon monoxide, plus varied terrain shaped by seasonal frost and geological processes. Telescopes on Earth and in space had already hinted at these ingredients before the flyby. Spectroscopy is one of the main tools scientists use to study distant worlds without landing on them.
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