Flat-earthers tend to get all the attention these days, and I don’t begrudge them their fame. But I regret that it comes at ...

The study calculated how large a hollow planetoid could be without collapsing in on itself, and the likelihood of a primordial black hole passing through an object on Earth. (If you're worried ...

Primordial black holes (PBHs) are fascinating relics ... but would be no larger than one-tenth the size of Earth. “We can detect these hollow objects by studying their orbits,” Stojkovic ...