Some may remember that Pluto was once considered our solar system’s ninth planet until it was demoted to dwarf planet in 2006, when scientists began to realize how many planetary bodies exist ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

So, while Earth will eventually leave the solar system one way or another, it's not something we will have to worry about for a few billion years yet. Probably. Originally published on Live Science.

“An Earth-like planet far beyond Neptune could redefine our understanding of the solar system,” says Lykawka. He adds, “It would not only restore the count of nine planets but also challenge ...

Pentagon officials said aliens could be visiting the solar system, according to a document. REUTERS NASA was given a task by Congress to find 90% of all objects near Earth that are larger than 140 ...

A new interstellar object, A11pl3Z, has been discovered in our solar system, marking the third such object to be observed. It ...

They are joined for this episode by Andy Rivkin at Johns Hopkins University in Maryland, who says that the only way to create a geocentric solar system is to make Earth the most massive thing ...

Scientists now say an interstellar comet discovered earlier this month could be one of the oldest that astronomers have ever encountered.

In fact, our planet is something of a geological oddball given what we know about our solar system neighbors. Granite isn’t the only rock that’s ordinary on Earth but rare on other worlds.

The quest to find hidden worlds. Searching for planets lurking in the frigid edges of our solar system is not a new concept. The so-called Planet Nine, a world 10 times more massive than Earth, is ...

“An Earth-like planet far beyond Neptune could redefine our understanding of the solar system,” says Lykawka. He adds, “It would not only restore the count of nine planets but also challenge ...