Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

An interstellar trespasser known as 3I/ATLAS is almost certainly a comet. So, why do so many people think it's ...

The Solar System is more than just planets; it is home to a dazzling variety of moons, each with its own unique charm. Some ...

While the feds idled, an interstellar object known as 3I/ATLAS was barnstorming the solar system, at a speed that reached 153 ...

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

About 4.5 billion years ago, Earth had a violent neighbor. A young, still-forming planet named Theia slammed into our world with enough force to melt vast portions of its mantle and scatter a huge ...

Isotopic fingerprints in lunar, terrestrial, and meteorite samples show Theia formed in the inner Solar System, likely near ...

An interstellar tourist is taking a quick trip through our solar system, becoming one of just three known objects to ever do so, according to NASA. A comet from a solar system outside our own was ...

Potential impactors are most likely to have low velocities and the highest likelihood of hitting Earth during the winter.

This gallery contains 74 images of different star systems with cometary belts (known as “exocomets”) taken with the Submillimeter Array (SMA) and the Atacama Large Millimeter/submillimeter (ALMA) ...

Astronomers say they spotted signs of a giant explosion releasing from a star beyond our solar system, one powerful enough to destroy a planet’s atmosphere.

A clear look at the discovery of 40,000 near-Earth asteroids, how scientists track them, and the missions working to keep our ...