I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, ...

NASA has responded to speculation that mysterious interstellar object 3I/ATLAS is actually an alien starship preparing to invade Earth.

The official number of exoplanets—planets outside our solar system—tracked by NASA has reached 6,000. Confirmed planets are ...

Discover Our Solar System Through Detailed 3D Models Forget dusty textbooks and flat diagrams. We’re talking about ...

Astronomers have spotted a planetary system being conceived from the swirl of gas and dust surrounding a star — giving us an unprecedented, real-time look at how our solar system would've formed some ...

The Interstellar Mapping and Acceleration Probe (IMAP) is being launched later this month to study the outer reaches of the ...

Ever since the first explorers charted the outer reaches of our Solar System, its true boundaries have remained hazy. While the Voyager probes have gone far into interstellar space, our Sun’s ...

In late 2017, a mysterious object tore through our solar system at breakneck speed. Astronomers scrambled to observe the fast-moving body using the world's most powerful telescopes. It was found to be ...

The Oort Cloud, an expanse of icy bodies in the far reaches of our solar system, is shown here in a scene from "Encounters in the Milky Way," a show at New York City's Hayden Planetarium that spawned ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

Most comets, including the well-known Halley's, loop through our solar system like cosmic time capsules that formed alongside our Sun and planets around 4.5 billion years ago. But every now and then, ...