Scientists have captured faint magnetic signatures resulting from the tidal movement of seawater across the planet — and they might have to wait until 2030 to get another shot at it.
Backpacking the eastern Sierra, I made camp atop Iron Mountain. Tomorrow’s hike would require crossing a nearby ridge. Several low spots in the ridge marked where the walk would take the least effort.
NASA is worried about the South Atlantic Anomaly (SAA). This anomaly affects Earth's magnetic field, which may pose risks to satellites and the International Space Station. The SAA is caused by ...