Every day, about three large fragments of decommissioned satellites and used rocket stages make their return into Earth's atmosphere. However, their final trajectory and behavior during descent remain ...

To learn how the Earth moves in the moments before, during, and after an earthquake, scientists use data from expensive underground sensors. Unused fiber-optic cables, known as dark fiber, could ...

In the early morning of April 2, 2024, the sky over southern California lit up with flashes of blazing light. Residents were bewildered. Were they missiles? A crashing plane? The unusual activity ...