ATLANTA — The chance of Asteroid 2024 YR4 hitting Earth has doubled, now sitting at 2.3 percent. The headlines alone can make one nervous. So, is it something to be concerned about?

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

For most of history, the Moon was regarded as a mysterious and powerful object. Then scientists made it into a destination ...

All eligible objects you can select the “Search for Shard of Time” option on have the special Blast from the Past event icon featuring Emit Relevart on them. You can freely click around on different ...