Excavations on unpromising mounds in the Iraqi desert revealed Sumer’s earliest city. Surviving relics and a rebuilt temple have given experts more clues about the ancient metropolis of Eridu.

A warm blob of water in the North Atlantic is an ominous sign that a system of currents that regulate the planet's climate could be weakening.

For the past four years, NASA 's Perseverance rover has rambled over a region of Mars where scientists say a strong river ...