New research suggests that a massive, unidentified object might have passed through our Solar System billions of years ago, ...

The six curiosities that Brown and Batygin identified have elongated elliptical orbits whose perihelia (their ... distance from just outside Neptune's orbit to all the way in to Uranus and even ...

For the first time, astronomers have traced a fast radio burst (FRB) to the outskirts of an ancient, dead, elliptical ...

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade". Throughout much of January and February, Venus, Mars, Jupiter ...

It's easy to forget we're standing on one of the best viewing platforms in the solar system – Planet Earth. And this week, Earthlings will be treated to one of the most spectacular views of ...

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

"At first, I thought I completely messed up during our research," Olivia Achenbach of the United States Naval Academy told ...

In the years following the launch of NASA's Hubble Space Telescope, astronomers have tallied over 1 trillion galaxies in the universe. But only one galaxy stands out as the most important nearby ...