The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

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

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Jupiter, the largest planet in our solar system, signifies growth, luck, and higher learning in astrology. Its placement in a ...

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

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

These embryos, somewhere between small planetesimals and fully formed planets, were abundant during the solar system's formative ... in the earliest days of our cosmic neighborhood.

Every couple of days it will scan the night sky with the largest camera in ... notion that there is a ninth planet lurking out in the darkness of our Solar System beyong Neptune.