A new proof marks the first progress in decades on important cases of the so-called kissing problem. Getting there meant ...

A cosmologist suggests we should look for exploration, along with energy signatures, to try and find aliens. Dyson spheres of some kind may be built to harvest energy from dark matter in black holes.

An astronaut on the International Space Station captured mysterious blue spheres in the sky last year. NASA’s Earth Observatory shared the photo last year, as well, shortly after it was taken.