The SpaceX-3 Falcon 9 rocket lifts off from Space Launch Complex 40 at Cape Canaveral Air Force Station carrying a Dragon spacecraft to the International Space Station. Liftoff was at 3:25 p.m 4/18/14. EDT.The company’s April 14 launch to the orbiting laboratory was scrubbed due to a helium leak in the Falcon 9 rocket that will launch the Dragon spacecraft to the space station.

Dragon is carrying to the space station almost 5,000 pounds of science and research, crew supplies, vehicle hardware and spacewalk tools — all to support the crew and more than 150 scientific investigations planned for Expeditions 39 and 40. If needed, another launch attempt will take place at 3:02 p.m. Saturday, April 19.

NASA Television coverage of Dragon’s arrival at the space station will begin at 5:45 a.m. Sunday, April 20. Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency will use the space station’s robotic arm to capture the spacecraft at approximately 7 a.m. NASA’s Rick Mastracchio will support Wakata during the rendezvous. NASA Television coverage will resume at 9:30 a.m., as the Dragon is attached to the Earth-facing port of the space station’s Harmony module.

An April 18 launch will allow the space station program to plan for a spacewalk on Wednesday, April 23, to replace a failed multiplexer-demultiplexer (MDM) relay system. The prime MDM, which is operating normally, and the failed backup computer provide commands to some space station systems, including the external cooling system, Solar Alpha Rotary joints and Mobile Transporter rail car.