Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science fiction. Measuring the mass of such a small planet based ...

Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

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 ...

Thanks to an enormous stroke of luck and serendipitous timing, astronomers were able to calculate the mass and distance of a free-floating planet for the first time. Learn more about it.

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. As many as 200 worlds beyond our solar system discovered by astronomers may be larger than ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

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