Besides stars, the United States Navy uses quasars as beacons. Quasars are distant galaxies with supermassive black holes, surrounded by ... X-Ray Flashes from a Nearby Supermassive Black Hole ...

Jan. 8, 2025 — Older people wait an average of just over a month to see a neurologist for specialty care after being referred by their primary care physician or another physician, according to a ...