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

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

One of the most important features of extrasolar planets is whether they have an atmosphere or not. For astrobiology in particular, small, rocky planets blanketed with an atmosphere offer the best hop

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

A mosaic image of Enceladus created from data ...

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