A Harris Poll survey - conducted online in December on behalf of the American Psychological Association - reports that more than half of U.S. adults (56%) cite climate change as the most important issue facing the world today.

Astronaut Christina Koch has returned to Earth after a record-breaking stay of 328 days aboard the International Space Station. She now holds the record for the longest single spaceflight by a woman.

Scientists have identified ancient mosses in, on and around the 5,300-year-old glacier mummy that add to the story of the final 48 hours before his murder.

Every February 2, a weather-prognosticating groundhog in Pennsylvania tells us if we should expect 6 more weeks of winter or an early spring. Should we believe him? Phil's track record here.

A report suggests that snakes – the Chinese krait and the Chinese cobra – might have been the original source of the coronavirus that's triggered an outbreak of deadly infectious respiratory illnesses in China this year.

Watch the last of January's 3 International Space Station spacewalks tomorrow.

Cast your vote to help name the next Mars rover, scheduled to launch in July or August 2020. The names were drawn from 9 finalist essays written by K-12 students. The voting will remain open through January 27.

Byrd received the prize from the American Astronomical Society, the largest organization of U.S. astronomers. The prizes are given for outstanding achievements in scientific research, education, scholarly writing, and service to the astronomical community.

For future homes on the moon, Mars, and other worlds, NASA is exploring technologies that would use mushrooms to grow self-repairing, self-replicating habitats.

Nearly a decade after the nuclear accident in Fukushima, researchers have found that wildlife populations are abundant in areas now devoid of human life.