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

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

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

Monroeville Public Library is holding a three-part children’s series on space, where participants learn fun facts about the ...

These embryos, somewhere between small planetesimals and fully formed planets, were abundant during the solar system's formative stages and played a critical role in planetary formation.

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

The Planet That Influences the Sun?! Jupiter is not just the largest planet in our Solar System, but also one of its most mysterious and powerful worlds! Thanks to NASA’s flybys and orbiters, we’re ...

There are eight planets in the solar system, and each travels on its own path around the sun. But of these planets, which is nearest to the sun? Mercury is a strange little world. There are some ...

If you get the question in Trivial Pursuit “how many plantes are there in the Solar System ... orbit around the Sun on a more or less flat plane like the eight planets.

A new type of exoplanet has been discovered: Enaiposha, also known as GJ 1214 b. Long heralded as a mini-Neptune, new observations have indicated that it is a member of a category never seen before ...