The largest sample yet of the faintest and earliest known galaxies in the universe, revealed by Hubble. Some formed just 600 million years after the Big Bang.
Floods and landslides remain a risk from Patricia - strongest storm yet recorded in the Western Hemisphere. The storm caused less damage than expected. It went from a tropical storm to a Category 5 hurricane in just 24 hours.
For the past three years, Antarctic sea ice at maximum set records. This year, that didn't happen, and a sea ice scientist called it "a return toward normalcy."