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

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in circular orbits around the Sun on a flat disk. But in reality, our Solar ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Emily Simpson has loved space since she was a 10-year-old kid celebrating her birthday at a planetarium. Now a recent Florida ...

The Red Planet will be at its closest point to Earth, also known as perigee, on Jan. 12 and will be exactly opposite the sun ...

The best part: no motion sickness. Raymond Shubinski Contributing Editor This question and answer originally appeared in the May 2013 issue. The post Where is the solar system heading? appeared first ...

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

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the ...

So, when comets outgas, they have what planetary scientists call nongravitational acceleration—motion that isn't caused by the gravity of objects in the solar system. Planetary scientists ...

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...