Earth always has a second temporary moon, researchers claim

In the fall of 2006, observers at the Catalina Sky Survey in Arizona found an object orbiting the Earth. At first, it looked like a spent rocket stage -- it had a spectrum similar to the titanium white paint NASA uses on ...

Planet 9 is running out of places to hide

We have a pretty good idea of what lurks within our solar system. We know there isn't a Mars-sized planet orbiting between Jupiter and Saturn, nor a brown dwarf nemesis heading our way. Anything large and fairly close to ...

Earth captures new 'mini moon'

Earth has acquired a second "mini-moon" about the size of a car, according to astronomers who spotted the object circling our planet.

Found: three black holes on collision course

Astronomers have spotted three giant black holes within a titanic collision of three galaxies. Several observatories, including the Chandra X-ray Observatory and other NASA space telescopes, captured the unusual system.

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