Our Sun’s outer atmosphere, the corona, is millions of degrees hotter than it should be, and no one knows why.

Comet 3 Atlas, the third confirmed interstellar object, speeds through our solar system at 68 km/s. Originating from another ...

The new planetarium show revealed a backwards S-shaped spiral in what's known as the Oort Cloud far beyond Pluto (American Museum of Natural History via AP) Scientists have solved one of the solar ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar system. Now, a team of researchers have taken a completely different approach to ...

Folks, it’s official: the object that astronomers recently spotted blowing through the outer solar system came from interstellar space. Yesterday, the intriguing stranger was named A11pl3Z. Now, it’s ...

The interstellar object dubbed 3I/ATLAS has been fascinating astronomers since its discovery in early July. The object, generally believed to be a comet, is screaming through the solar system at ...

A massive comet traveling through the solar system is much larger than previously thought and could be a remnant of alien technology, a scientist claims in a new report. 3I/ATLAS was first identified ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.) The interstellar comet, originally called A11pl3Z and now ...

When NASA launched the Pioneer probes, they were met with an intriguing mystery. At around 20 astronomical units, both ...

It’s a stellar discovery. A Manhattan-sized interstellar comet was spotted blazing through our solar system — marking only the third time a mysterious object from beyond our cosmic neighborhood has ...

Scientists have solved one of the solar system's enduring mysteries with the help of an unexpected source: a planetarium show. Last year, experts at the American Museum of Natural History were ...