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

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

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

Missing planets? That literally happens all the time IRL. Here's why the Star Wars trope of incomplete star maps and missing ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

While this parade of planets look to our eyes to be huddled in the evening sky, they are of course spread out across a vast chasm of space across the solar system, separated from each other by ...

"A parade of planets, also sometimes referred to as a planetary alignment, is when several planets in our solar system appear to line up in the ... But that can lead to a facade of coldness that isn't ...

A rare celestial event where seven planets align is visible in the UK skies. Discover how, when, and where you can observe ...

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

"A parade of planets, also sometimes referred to as a planetary alignment, is when several planets in our solar system appear to ... coldness that isn't at all accurate. Since you crave intimacy ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests. The ...