Watch a live view of the Atlas 5 launch pad with countdown audio (members only)

The next time astronauts land on the moon, they will ride to the lunar surface in a spacecraft that looks a lot different than the Apollo-era landing module last used in 1972. Lander concepts proposed by SpaceX, Blue Origin and Dynetics — which won a combined $967 million in NASA funding Thursday — take wildly different approaches to carrying crews to the moon.

The launch of the first batch of new-generation Iridium communications satellites Saturday marked the beginning of the end for the predictable, spectacular flares of reflected sunlight produced by the old-design craft, a favorite of amateur skywatchers for nearly two decades.

The United Launch Alliance Atlas 5 rocket blasted off Thursday night with NASA’s Magnetospheric Multiscale satellite quartet in a successful flight from Cape Canaveral.