NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth. The ...

Some are almost spheres, like planets, but most are irregular shapes. Some are the size of small stones and pebbles. Some measure hundreds of kilometres across. The largest object is the asteroid ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

concentrated on understanding the intricate dynamics leading to the reduction in size of specific sub-Neptune planets. Christiansen's team suggested a compelling link between the cores of select ...

WASP-127b's diameter is about 30% larger than Jupiter, our solar system's largest planet. But its mass is only about 16% that ...

In 1992 astronomers reported the first planet-size masses around a dead star, the pulsar PSR1257+12, which sits 2,000 light-years away. Three years later came news of the first known exoplanet ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests.