The reasoning was that it didn't satisfy one of three newly defined criteria to be a planet. They were: The body must orbit its host star, just as Earth and Jupiter orbit the sun. It is large ...

Some interpretations of the phrase include the planets lining up on the same side of the sun all right next to each other. The planets can never fully line up exactly like you see in pictures ...

According to NASA, planets always appear in a line in the sky. The planets rotate around the sun basically in a disc-shaped ...

Consequently, even though it is one of the closest stars to Earth, such that its light takes only six years to get here, it ...

Whenever planets are visible in the night sky, they always appear roughly along the same line. This path, known as the ...

After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.

Astrophysicists have once again enriched our knowledge of the cosmos with a new discovery: two small planets orbiting ...