Using a new type of imaging, doctors were able to peer into the eyes of a young woman and see — on the cellular level — the type of damage that occurs from looking directly at the sun during an eclipse.
A tiny slowdown in Earth's rotation next year could trigger more earthquakes than usual, new research suggests.
Sometimes Earth looks like a whole 'nother planet.
Explore the real-life mysticism of Salem, Massachusetts.
America's national parks and monuments are at risk.
NASA's OCO-2 satellite observed carbon dioxide response to one of strongest El Niños on record.