Filmmaker Adam Nemoy helps celebrate the 90th anniversary of Pluto's discovery this month at the 6th annual 'I Heart Pluto' ...

There are eight planets in the solar system, and each travels on its own path around the sun. But of these planets, which is nearest to the sun? Mercury is a strange little world. There are some ...

AN alien world “suffers star-grazing torture” every 111 days as its fiery sun boils the planet to a hellish 1,093C. This ...

It actually follows its own tiny elliptical orbit around what is called the center of gravity (the barycenter) of the system, the sun and the orbiting planets. This barycenter is usually not equal ...

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

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

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

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

The eight major planets of our Solar System orbit the Sun in the same flat plane, and all at different speeds. Mercury, the ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

While planets circle the sun in what's called and heliocentric orbit, they rarely fall together in what appears to the human ...

Witness a rare celestial spectacle as seven planets align in the night sky for one night in late February, offering a ...