A SpaceX Dragon cargo spacecraft arrived at the International Space Station Sunday (April 10) to deliver vital supplies, science experiments and a prototype inflatable space habitat for the orbiting outpost and its six-person crew.

Launched on Friday (April 8) from the Cape Canaveral Air Force Station in Florida, the Dragon pulled up to space station on this morning where it was captured by the orbital complex's Canadarm2 robotic arm.

"It looks like we caught a Dragon," British astronaut Tim Peake of the European Space Agency radioed to Mission Control after snagging the spacecraft with the station's arm. Dragon was later attached to the Earth-facing port on the station's Harmony module at 9:57 a.m. EDT (1357 GMT) to begin its one-month stay. [SpaceX's Dragon Flight to Space Station in Photos]

The Dragon's arrival marked the first time that two U.S. commercial spacecraft were berthed to the space station simultaneously. Orbital ATK's "S.S. Rick Husband" Cygnus cargo carrier launched to the station on March 22 and was attached to the Earth-facing port on the Unity module four days later.

In between the two U.S. arrivals, Russia launched its own Progress resupply ship on March 31. It docked at the rear port of the Zvezda service module on April 2. As such, there are now a total of six visiting vehicles at the space station, including the Dragon, the Cygnus, two Progress and two Russian Soyuz spacecraft.

"A cornucopia of cargo craft now at the International Space Station," NASA spokesman Rob Navias said during docking commentary today.

The record number of vehicles berthed and docked to the space station has only been matched one time before, when the space shuttle Discovery docked to the orbital complex during its final mission, STS-133, in 2011. In addition to launching Dragon to the space station, SpaceX also landed its Falcon 9 rocket on a drone ship for the first time during this delivery flight.

Dragon on board

Working inside the space station's multi-windowed Cupola, Peake commanded the 60-foot-long (18 meters) Canadarm2 robotic arm to reach out and grab hold of the Dragon capsule. The Dragon's capture came at 7:23 a.m. EDT (1123 GMT). It was firmly attached to its berthing port on the Harmony module just over 2.5 hours later.

With the Dragon's arrival came almost 7,000 lbs. (3,175 kilograms) of cargo, including 3,800 lbs. (1,700 kg) ofcrew supplies, spacewalk gear and science experiments.

The new experiments will help investigators assess the impact of antibodies on muscle degradation, seek insight into the interactions of particle flows at the nanoscale level and use protein crystal growth in microgravity to help in the design of new drugs to fight disease.

The Dragon is also delivering "Tokyo Bekana" Chinese cabbage and "Outredgeous" red romaine lettuce seedsto be grown in the space station's Veggie chamber. The plants, selected for how well they grow and taste, as well as their nutritional value, will be the second crop of vegetables to be cultivated and consumed by the station's astronauts, should they grow as expected.

Inflatable space room BEAM'd up

Also aboard the Dragon, packed inside its unpressurized trunk section, is BEAM — the Bigelow Expandable Activity Module — an experimental inflatable space habitat that will be attached to the aft port of the Harmony node.

Designed by Bigelow Aerospaceand based on a NASA concept for expandable habitats, the BEAM will allow investigators to gauge how well the module protects against solar radiation, space debris and contamination, paving the way for the future, much-largerinflatable space habitats.

"BEAM is going to be installed, we're thinking [on] the 15th or 16th of this month, so relatively quickly after Dragon arrives," said Kirk Shireman, NASA's manager of the International Space Station program, at a press conference after the Dragon's launch on Friday. "There is a certain period for thermal stabilization once it arrives." [Meet BEAM: The Space Station's Inflatable Room in Pictures]

The space station's robotic arm will be used to extract the deflated BEAM from the Dragon's trunk and attach it to the orbiting outpost for a two-year test.

BEAM will then remain in its unexpanded form until late May, when it will be inflated to a size four times its launch volume, or about the size of a small bedroom.

"The inflation is probably not until the end of May, somewhere around the 25th, 26th of May," said Shireman. "There is a lot of work involved in preparing for that and we also want a good quiescent period on board the International Space Station."

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Robert Pearlman is a contributing writer and the editor of collectSPACE.com, a Space.com partner site and the leading space history news publication. Follow collectSPACE on Facebook and on Twitter at @collectSPACE. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

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