Mercury is the smallest planet in the Solar System and also the closest planet to the Sun. Mercury orbits the Sun at an ...

NASA is gearing up for an exciting chapter in lunar exploration by sending a trio of high-tech instruments to the Moon. Two of the devices will be attached to a new lunar rover capable of carrying ...

Several planets stand still in the sky, Titan’s shadow transits Saturn, and Venus gives Taurus a second eye in the sky this ...

Lake Effect astronomy contributor Jean Creighton shares some myths behind some of our solar system’s most famous moons and ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

The moon's near and far sides exhibit striking asymmetry—from topography and crustal thickness to volcanic activity—yet the ...

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

The pH scale is a measure of how acidic or alkaline something is, 1 being highly acidic, 14 being highly alkaline, and 7 ...

Titan, Saturn's largest moon and the second-largest in the solar system, is a world unlike any other. With a dense atmosphere ...

Celebrate the Fourth with the Fireworks Galaxy, then check out the Demon Star Algol and the Full Buck Moon in the sky this ...

The NASA/ESA Cassini-Huygens mission explored Saturn and its moons from 2004 to 2017, providing the most detailed images and ...

The solar wind pushes some of the gas and dust away from the comet, forming those beautiful tails we see. A comet actually ...