Watch the Falcon 9 and Crew Dragon arrive at the launch pad (members only)

These narrated videos show the pre-launch preparations that readied the United Launch Alliance Atlas 5 rocket and the Orbital ATK Cygnus commercial cargo-delivery spacecraft for flight and rolling to Complex 41 for liftoff to the International Space Station.

NASA’s Ionospheric Connection Explorer satellite was scheduled to launch Wednesday aboard an air-dropped Northrop Grumman Pegasus XL rocket over the Atlantic Ocean, but managers aborted the mission after encountering a technical concern with the rocket following departure from Cape Canaveral Air Force Station. The launcher’s L-1011 carrier jet returned to Florida.

John Spencer, the New Horizons Deputy Project Scientist, reveals the first multi-pixel image of Ultima Thule which provide hints at its shape during a news conference at the Johns Hopkins Applied Physics Laboratory.