Something strange is happening in Earth’s magnetic field, and it has caught NASA’s attention. A massive region of lower magnetic intensity, known as the South Atlantic Anomaly (SAA), has appeared ...

fled to the U.S. in 1939 and revolutionized Earth mapping through her work with the Army Map Service. Her contributions, including the Fischer Ellipsoid and foundational work for GPS and Apollo ...

Satellite images of Earth at night have been a curiosity for the public and a tool of fundamental research for at least 25 years. They have provided a broad, beautiful picture, showing how humans have ...