Mysterious driftwood high in Grand Canyon caves hints at the legacy of Arizona’s huge impact crater.

Scientists estimate a 4.3 percent chance that asteroid 2024 YR4 could strike the Moon, creating a massive crater and triggering a meteor shower visible from Earth.

A close-up view of a portion of a "relatively fresh" crater, looking southeast, as photographed during the third Apollo 15 lunar surface ...

The findings are a big clue as to why the far and near hemispheres of the moon look so different.

In the summer of 1908, a blast over remote Siberia flattened trees across an area larger than some countries and lit the sky as far away as Europe. With no crater, no confirmed meteorite fragments and ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction.