For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare great planetary alignment. Here's how to make sure you don't miss this ...

Prevailing solar system formation theories indicate that these planets should have at least started out following perfectly circular and share the same orbit. But today, their paths are slightly ...

The solar system is made up of the Sun (our nearest star) and the objects that orbit around it, including planets, asteroids and comets. Planets orbit the Sun in roughly circular paths ...

Now, using a powerful NASA supercomputer called "Pleiades," scientists have discovered yet another spiral structure on the edge of our solar system ... out beyond the orbit of Neptune, which ...

Interestingly, they'll always appear along the same arc in the night sky. That path is called the ecliptic, and it exists because all planets in our solar system orbit around the sun on roughly the ...

This week's viewing is post-sunset. All eight planets in our solar system orbit the sun on the same path or plane but at different speeds and different distances from the sun. Some planets have ...

The planets orbit the sun continuously. Because they're traveling along the same path (ecliptic), at times ... To learn more about the solar system's eight planets, go to NASA's planet information ...