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

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

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

James Webb Space Telescope captures HH 30’s disc, revealing dust movement, jets, and planetary formation processes.

Worlds with liquid water could have formed just 200 million years after the big bang from the remains of the earliest ...

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

In this series, we cover provocative questions in astronomy. This week: the mysterious extragalactic signals known as Fast ...

Exoplanets have captured the imagination of the public and scientists alike and as the search continues for more, researchers ...

Using the gravitational pull of a well-placed planet, such as Jupiter, to slingshot a spacecraft outwards can reduce the travel time dramatically Reaching the outer planets with a spacecraft is ...

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.