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

It's not especially remarkable for a few planets to line up in the sky, but the sight of four or five brilliant planets at once is less common, according to NASA. How does the ali ...

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

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 ...

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

Six planets of our solar system would form a beautiful arc as they align in the same area producing a spectacular view that ...

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

The sun's distance from Earth changes throughout the year but it has nothing to do with ... of other planets. "In about 1604, Johannes Kepler fitted an ellipse model of Mars' orbit to observations ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

For much of January and February, you have the chance to see six planets in our solar system after dark, although two — Uranus and Neptune — will be hard to see without a telescope or high-powered ...