The Largest Alien Planet of TRAPPIST-1 Has an Atmosphere That Evolved Over Eons
The largest of the worlds in the seven-planet TRAPPIST-1 system boasts an atmosphere that has evolved over time, rather than the one that formed with it. Observations made with NASA's Hubble Space Telescope reveal that the planet's atmosphere is different from its nascent environment, meaning it's most likely a rocky world similar to others in the system. "This atmosphere is not the one it was born with," Hannah Wakeford, a researcher at the Space Telescope Science Institute in Baltimore, Maryland, told Space.com.
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