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

Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our ...

Two new studies show a briny, carbon-rich environment on the parent body of the Bennu asteroid was suitable for assembling ...

Scientists have detected organic compounds and minerals necessary for life in the samples collected by the OSIRIS-REx mission ...

NASA’s James Webb Space Telescope has revealed the atmospheric origin of exoplanet GJ 1214 b and its results challenges ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Mars is home to perhaps the greatest mystery of the Solar System: the so-called Martian dichotomy, which has baffled ...

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

We found rare specimens, like a pallasite meteorite, which reveals details about major collisions in solar system history.

The Framers of the U.S. Constitution designed a unique system to choose our president in 1787: the Electoral College. More ...