Ghost particles of the milky way

Might our universe – as vast as it is – be simply one of many? We look at the growing evidence that there’s more than one cosmos out there

GLOBAL EYE

When comet 3I/ATLAS was discovered in July, on a one-way interstellar journey through our Solar System, Harvard astronomer Avi Loeb suggested it might be an alien spacecraft paying us a visit. Back in

Earth exists in a bubble. Our atmosphere forms a protective barrier between everything on the planet’s surface and the near-empty vastness of space. But it’s not the only bubble Earth sits inside. Bey

It’s difficult to know for sure how many electrons are in the Universe. British physicist Arthur Eddington (1882–1944) came up with a number in 1938, now known as the ‘Eddington number’. Eddington’s c

While our planet only has one easily visible Moon, several other tiny objects arguably deserve the title too