毅力号360度全景:不寻常的石块和寻找火星生命
2021年03月09日 Perseverance 360: Unusual Rocks and the Search for Life on Mars Image Credit: NASA, JPL-Caltech, ASU, MSSS Explanation: Is that a fossil? Looking through recent images of Mars taken by the new Perseverance rover may seem a bit like treasure hunting, with the possibility of fame coming to the first person to correctly identify a petrified bone, a rock imprinted by an ancient plant, or any clear indication that life once existed on Mars. Unfortunately, even though it is possible that something as spectacular as a skeleton could be identified, most exobiologists think it much more likely that biochemical remnants of ancient single-celled microbes could be found with Perseverance’s chemical analyzers. A key reason is that multicellular organisms may take a greater amount of…