Physicists working at the Large Hadron Collider have spotted a long sought-after exotic particle that's the strongest evidence yet for a new form of matter called a tetraquark. Here's what the discovery could mean to astrophysics.
A couple months ago, scientists with IceCube, an Antarctica-based neutrino observatory, discovered two very high-energy neutrinos — named Bert and Ernie — that appeared to have originated from beyond our solar system. This is amazing news, and we talked to the researchers about what it means.
Now we know how hot things got when the universe was born. We've taken the temperature of a substance that only existed when time first began. It's an ultrahot, 4-trillion degree "soup" of subatomic particles made from gold.