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 ...

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For anyone who’s spent an evening from the rim at Crater Lake, it’s no surprise it has been named the United States’ best national park for stargazing.

Hepatitis B spreads when the bodily fluids of an infected person enter another person's body. Sexual contact is one way it can be spread. A person with HBV can spread it to their baby during ...