Red dwarf stars have several virtues that make them potential homes for Earth-like planets, but a new study suggests they also produce the largest solar flares ever seen.
Scientists have found a microbe in Mono Lake, California, that uses arsenic as a fundamental building block, changing the definition of 'life as we know it' and the search for extraterrestrial life.
Chemical data from Titan returned by NASA's Cassini spacecraft has led scientists to speculate that there are organic processes happening on the Saturnian moon's surface. But, if the data are correct, there are a lot of non-biological explanations that need to be ruled out first.
Column: We know a lot about life on Earth, but we're still learning fundamental insights all the time.