Astronomers Are Finding Earth-Like Planets. Which Ones Might Harbor Alien Life?

Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.
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The Webb telescope's look at an Earth-size alien planet was bleak

As scientists delve deeper into a star system with seven rocky worlds, the prospect of one being a habitable planet seems to be quickly fading. Researchers who used the James Webb Space Telescope, a ...

Ask Dr. Universe: Scientists use multiple tools to figure mass, size of planets

Scientists on Earth use seismometers to get a more detailed picture of what the inside of the Earth is made of. Those seismometers record vibrations from earthquakes. The vibrations change depending ...
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The Webb telescope's look at an Earth-size alien planet was bleak

Scientists did not find a robust atmosphere around TRAPPIST-1d, an Earth-size exoplanet many hoped would show signs of having air. - NASA / ESA / CSA / J. Olmsted illustration As scientists delve ...