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 ...

The best smart smoke detectors add a layer of connectivity to this essential device in your home. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

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