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

The warming hole might be a sign that Atlantic Ocean currents are slowing down. This network of currents regulates Earth's ...

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.