Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...

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 ...

On August 25th, 2012, humanity became an interstellar species. There was no fanfare or galactic welcome party as a humble robotic probe, the Voyager 1 spacecraft, crossed an invisible threshold. It ...

Earlier this month, astronomers were thrilled to spot an interstellar object — only the third of its kind ever observed — hurtling toward the center of the solar system on an extremely unusual ...

A comet known as 3I/ATLAS made news in July when it was confirmed to have originated outside Earth's solar system. One infamous theory even posited that the interstellar interloper, estimated to be ...