For several years, astronomers have been aware of a much-ballyhooed “city-killer” asteroid named YR4 2024, which is hurtling ...

YR4 has a very small chance of impacting Earth on Dec. 22, 2032- but one that has increased slightly since it was first spotted. The latest impact probability is available on the automated Sentry page ...

The U.S. Space Force released a breathtaking image of Earth from its mysterious space plane that shows the planet from thousands of miles away ...