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

then it could disprove the notion that there is a ninth planet lurking out in the darkness of our Solar System beyong Neptune. But should the orbits of the new objects follow the trend ...

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the month – four of which will be visible with the naked eye, Preston Dyches, ...

When two giant planets collide ... or started out small and achieved super-size status by merging with other gas giants. The answer could help explain why our solar system missed out on its ...

There are eight official planets (sorry, Pluto) in our solar system: Mercury ... If not, the chances it really is out there are slim to none. One problem with finding so-called Planet Nine ...

All the planets in our solar system, except Mercury and Earth, will move into a large arc that just fits into your eye's field of view. "That means we can just about see all planets without ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar ... planets, the team carried out 50,000 ...

It is the fastest wind ever measured in a jet stream that goes around a planet. In comparison, the fastest wind ever measured in the solar system was found on Neptune, moving at "only" 0.5 km per ...

She mapped our solar system's "alternate fate" had it housed an extra planet between Mars and Jupiter ... lower eccentricity evens out the four seasons into similar lengths, while higher ...