It’s not hard to keep track of NASA’s big-ticket items—the high visibility spacecraft that generally carry equally high price tags and make very big headlines. There’s the $150 billion International Space Station; the $10 billion James Webb Space Telescope; the $2.4 billion Perseverance Mars rover; and then, of course, the trouble-plagued, $4.1 billion-per-flight Space Launch…

NASA’s Far-Flung Space Fleet Is Getting a Few Extra Years to Explore the Cosmos