Astronomers have discovered a rare cosmic alignment that may reveal hidden dark matter, offering a new way to study the invisible substance that makes up most of the universe.
Two exotic new theories suggest dark matter could be either made from tiny black holes or formed by Hawking radiation at the cosmic horizon.
The vast, seemingly empty spaces between galaxies are not entirely empty. So what's in these cosmic voids?
Structures known as "zippers" and "twisters" in the early universe may explain why dwarf galaxies tend to line up with each other, as well as hint at how dark matter operates in the universe.
