The computer that guided astronauts to the moon and back operated with roughly 2,048 words of erasable memory and 36,864 words of fixed memory, running at a clock speed near 2 MHz. A smartphone released in the past few years can execute billions of operations per second while simultaneously streaming video,

NASA said Friday it's revamping its Artemis moon exploration program to make it more like the fast-paced Apollo program half a century ago, adding an extra practice flight before attempting a high-risk lunar landing with a crew in two years. The overhaul ...