Snapshots from Atlas 5 launch

This collection of photographs shows the Air Force’s Global Positioning System 2F-12 navigation satellite being encapsulated in the United Launch Alliance Atlas 5 nose cone and hoisted atop the rocket for flight on Friday morning.

Blaming a slew of technical snags and “avoidable errors,” NASA officials said Tuesday that the launch of the James Webb Space Telescope, already years behind schedule, will be delayed to 2020, potentially pushing the mission’s development cost above an $8 billion cap mandated by Congress.

Eighteen astronauts have been selected — nine men and nine women — to begin training for upcoming Artemis missions to the moon, NASA announced Wednesday. The list includes the as-yet-unnamed next man and first woman who will set foot on the lunar surface later this decade.