Imagine a massive celestial body colliding with Uranus at high speed; this impact could have 'overturned' Uranus, causing its rotation axis to tilt. Moreover, the colliding body would have to be ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...