A study of magnetic fields suggests the Red Planet held water for longer than previously believed.

Andrew Knoll, Harvard’s Fisher Research Professor of Natural History and author of the recent popular science book “A Brief History of Earth: Four Billion Years in Eight Chapters,” shares six facts about the Earth.

Clara Sousa-Silva, whose expertise in phosphine as a biosignature gas was key to a recent analysis that may have detected life in the clouds of Venus, has moved to the Center for Astrophysics | Harvard & Smithsonian for the final two years of her fellowship. She discusses the finding and the broader topic of the search for life on other planets.