Like part of a cosmic Russian doll, our universe may be nested inside a black hole that is itself part of a larger universe. In turn, all the black holes found so far in our universe—from the ...

Dec. 19, 2025 Gravitational waves from black holes may soon reveal where dark matter is hiding. A new model shows how dark matter surrounding massive black holes leaves detectable fingerprints in the ...

You may have a severe headache, fever, and stiff neck if you have early-stage meningitis. Seek immediate medical care if you notice a non-fading rash using a glass test. You can prevent death from ...