A new study predicts areas of North Africa and the Middle East could experience a rapid temperature rise of up to 9 degrees Celsius (16 F) in the coming years.
NASA's Mars rover Curiosity is ready to leave an ancient river channel it's been exploring. Next, it'll go to a geological formation resembling giant spiderwebs.
Salmon are coming back to their ancestral homes after the demolition of four dams on the Klamath River, which flows along the California-Oregon border.
It was 100 years ago that Edwin Hubble showed, through observations and measurements of stars, that the Milky Way is only one galaxy of many in our universe.
MOND theory: There's increasing evidence that astronomical theories don’t match observations. Is it time to rethink our story of how our universe came to be?