Like a celestial parade across the cosmos, five bright planets are lighting up the night sky and visible with the naked eye ...

If you missed seeing the alignment of six planets in the sky in January, don't worry. Another one is coming up in February.

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

A planetary alignment goes down, up high, when more than two planets align in the sky. If three planets align, it’s known as a mini-planetary alignment; four makes for a small planetary ...

Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that the next won’t happen until 2040.

The astronomical linkup is fairly common and can happen at least every year depending on the number of planets. A similar parade took place last June, but only two planets could be seen without ...