The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

February will be an awe-inspiring month for astronomy enthusiasts who will be able to the see the solar system's planets ...

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see.

Have you ever wondered why the planets in our solar system align along a flat plane? Discover the science behind this cosmic arrangement, from the formation of the protoplanetary disk to the forces ...

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

Claims of a "rare planetary alignment" are misleading; it's just visible planets. A true "golden conjunction" occurs on Sept. 8, 2040.

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

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system. These embryos, somewhere between small planetesimals and fully formed planets ...

one which can offer superb views of the other bodies in the solar system. But which one to choose? We've got you covered with our guide to the best telescopes for seeing planets. Now's a great ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.