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

We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

NASA's leadership change comes at a pivotal moment for the agency, which is already bracing for potentially severe funding ...

The path of totality will carve an arc of darkness across the surface of our planet – at the height of the August tourist ...

The Senate appropriations committee initially voted in favor of a bill rejecting Trump's NASA budget cuts, but discussions ...

Astronomers tracking an interstellar object flying through the solar system think it comes from a star at least 8 billion ...