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

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

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

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 – ...

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

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

The OSIRIS-REx mission returned to the sample to Earth in September of 2023, and these studies show that it contains amino ...

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

Our Solar System is a carefully balanced celestial dance held together by a virtually perfect balance of gravity and inertia.

February will be an awe-inspiring month for astronomy enthusiasts who will be able to the see the solar system's planets ...

WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these ...