A comet born around another star is carrying water unlike anything ever measured in our solar system. Interstellar comet ...

On July 1, 2025, a telescope in Chile caught a faint smudge drifting across the sky. Within weeks, astronomers confirmed it ...

A tiny world in our Solar System has an atmosphere it shouldn’t—hinting something dramatic happened there recently.

In the far reaches of our solar system - beyond the outermost planet Neptune - resides a host of icy and desolate celestial ...

"If our solar system is indeed moving this fast, we need to question fundamental assumptions about the large-scale structure of the universe." When you purchase through links on our site, we may earn ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. The size of the solar system is defined by the volume ...

Look up at the night sky and among the stars you might see a few brighter dots — the planets in our solar system. What you won’t see, though, are the most common kinds of planets in the Milky Way: ...

It’s not every day you get a chance to spot multiple planets with the naked eye—but this month, you can. Venus and Mercury are both visible in the sky, offering a rare glimpse ...