White holes are the hypothetical opposite of black holes. While black holes suck in everything, including light, white holes are theorized to do the exact opposite—nothing can enter, and they ...

Some things in cosmology may simply be unknowable. Why is there something rather than nothing? What lies outside the universe? What is inside a black hole? That last one has been niggling at ...

Black holes are well known for swallowing everything around them, which is probably why they get talked about so often. On the flip side, white holes are their mysterious opposite. These theoretical ...