In this space wallpaper, NASA's prolific planet-hunting spacecraft has hit the jackpot again, discovering 11 new planetary systems with 26 confirmed alien planets among them.

In this space wallpaper, a runaway planet zooms through interstellar space. New research suggests that the supermassive black hole at our galaxy’s center can fling planets outward at ...

Throughout the universe, trapped in the halos of dark matter, there is enough planet-making material to create at least 1,000,000,000,000,000,000,000 more Earth-like planets. A billion trillion of ...

These are the 10 most bizarre planets that we know exist in our universe. 10. The Planet That Is Pink NASA's Goddard Space Flight Center/S. Wiessinger / Public domain.

How many planets are in the universe? One of the earliest lessons you learn in school is that our Solar System is made up of eight planets – plus Pluto. We live in just one of thousands of star ...

To build a planet you need lots of rubble and that means lots of heavy elements – stuff more massive than atoms of hydrogen and helium. The elemental composition of the collapsing nebula that ...

Dr. Universe: Besides telescopes and spaceships, how do we really know that there are other planets? – Ia, 12, Montana. Dear Ia, I looked through a high-power telescope for the first time in ...

The universe has two kinds of matter. There is invisible dark matter, known only because of its gravitational effects on a ...