A large sunspot has just reappeared on the sun's Earth-facing surface, almost two months after it first emerged. The ...

A new memorandum has firmed up China and Russia's intent to lead the construction of a new lunar base to be completed by 2036, as NASA talks about scaling back its own lunar ambitions.

Scientists hunting for the hypothetical Planet Nine have discovered a potential new dwarf planet, 2017 OF201, in the outer ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

A new dwarf planet discovery in the outer solar system is challenging the long-standing theory of a hidden giant planet ...

Scientists have identified the most powerful solar storm ever recorded, an extreme event that struck Earth around 12,350 BC, ...

Webb’s powerful instruments have detected crystalline water ice in a distant star system, offering rare insight into planet ...

Solar storms pose a real threat to today’s technology. Even smaller ones can disrupt satellites, power grids and GPS systems.