Astronomers didn’t even know sub-Neptunes existed until NASA’s Kepler mission uncovered them over the past decade. Although a ...

K2-18b, an exoplanet 120 light-years away, may be the best hope to confirm that life exists beyond Earth. Here's what to know ...

And although the first sign of possible extraterrestrials detected in the cosmos didn't come in the form of little green aliens flying ... a distant ocean-covered planet named K2-18b is likely ...