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 ...

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 ...

"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 ...

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 ...

Dark matter refers to material that does not absorb, reflect, or emit any electromagnetic radiation. Astronomers have ascertained the existence of dark matter through the gravitational influence it ...

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: ...