Watch live: Vice President Pence visits Kennedy Space Center

NASA says it is interested in flying astronauts and scientists on commercial suborbital vehicles, like those being tested by Virgin Galactic and Blue Origin, to provide additional training and research opportunities augmenting missions to the orbiting International Space Station.

A SpaceX Falcon 9 rocket sporting a fresh cleaning and several refurbishments took off Thursday from a seaside launch pad in Florida to send an SES communications satellite into space, then landed on a platform in the Atlantic Ocean to repeat a feat the same booster achieved nearly one year ago.

The next launch of a SpaceX Falcon Heavy rocket has been delayed from July to October to await the readiness of its U.S. military payload, and the following Falcon Heavy flight has been rescheduled from late this year to some time in 2022, military officials said.