The head of planetary defense at the European Space Agency discusses 2024 YR4, an asteroid with a small chance of striking ...
Two immense canyons on the moon's far side that rival Earth's Grand Canyon were produced by a cataclysmic collision nearly ...
New research shows that when an asteroid slammed into the moon billions of years ago ... of boulders hurtling at a speed of nearly 1 mile a second (1 kilometer a second). The debris landed ...
Two canyons that splay out from a vast asteroid crater on the moon may have been quickly formed by chains of impacts that ...
New research shows that when an asteroid slammed into the moon billions of years ago ... of boulders hurtling at a speed of nearly 1 mile a second (1 kilometer a second). The debris landed ...