Astronomers have discovered a strange new type of exoplanet known as a Hycean world—an ocean-covered planet with a thick hydrogen atmosphere. One of the most intriguing examples is K2-18b, located 124 ...

A NASA telescope in early development should be able to detect light bouncing off the surface of oceans on alien planets, vital information in the hunt for alien life. The Habitable Worlds Observatory ...

When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of biology because they are often produced by living microbes. However, ...