The question of whether Mars ever supported life has captivated the imagination of scientists and the public for decades. Central to the discovery is gaining insight into the past climate of Earth’s neighbor: was the planet warm and wet, with seas and rivers much like those found on our own planet? Or was it frigid and icy, and therefore potentially less prone to supporting life as we know it? A new study finds evidence to support the latter by identifying similarities between soils found on Mars and those of Canada’s Newfoundland, a cold subarctic climate.

The real reason airlines still board planes from front to back despite it causing huge aisle queues has been revealed. Passengers have long found boarding one of the most tiresome parts of flying - but an astrophysicist thinks there's a better way.

Local and national public-interest groups, as well as Havasupai Tribe members, delivered more than 17,000 petition signatures to Gov. Katie Hobbs today urging her to use her authority to close the Pinyon Plain uranium mine that threatens the waters of the Grand Canyon and the Havasupai Tribe.