“Super-Earths” keep popping up. The most numerous exoplanets are those between Earth and Neptune in size, yet they’re also the most perplexing. Are they rocky like Earth, complete with atmospheres and liquid water, but much larger? Or are they “mini-Neptunes” ...

Astronomers have identified a strange planet not present in our solar system orbiting other stars. It is neither too large nor too tiny but falls between the Earth’s and Neptune’s radii. Dense “super-Earths,” more prominent than Earth, are found near ...

An intriguing, rocky, and hot super-Earth amazes scientists with its features. The planet has almost three times the mass of Earth, but their densities are the same. Other measurements indicate the super-Earth is 50 % bigger than our planet and ...