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 – ...

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

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

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

Mercury is the closest planet to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury orbits ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

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 ...

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 ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.