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 ...

This fact sheet relies on people self-identifying their race and ethnicity in the Census Bureau’s 2023 ACS to describe the nation’s Black population. The racial and ethnic categories used in census ...

Choose from Santa Claus Elves Background stock illustrations from iStock. Find high-quality royalty-free vector images that you won't find anywhere else. Video Back Videos home Signature collection ...