International Space Station: SpaceX Dragon Brings 4,100 Pounds of Space Research and Hardware Down To Earth

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A Dragon capsule approaches the International Space Station on February 23, 2017. NASA/Flickr

More than 4,100 pounds of scientific research and hardware have dropped into the Pacific Ocean from space.

SpaceX's Dragon cargo resupply ship has returned from the International Space Station carrying ongoing research materials which, NASA announced last week, includes live mice, plants and fiber optic wire.

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SpaceX shared news of the successful landing on Twitter, writing: "Good splashdown of Dragon confirmed."

Good splashdown of Dragon confirmed, completing the second resupply mission to and from the @Space_Station with a flight-proven commercial spacecraft.

— SpaceX (@SpaceX) January 13, 2018

The spacecraft was launched on the back of a Falcon 9 rocket on December 15 from Cape Canaveral Air Force Station, Florida. It docked with the ISS on December 17, staying latched for almost a month. It brought supplies including a space junk shield and even ingredients for beer.

This mission saw both a Dragon cargo capsule and a Falcon 9 rocket reused for the first time as part of SpaceX's move towards sustainable space travel.

The company shared an image of the spacecraft on its way to land, writing: "Dragon is headed to port with ~4,100 pounds of scientific research and hardware for a cargo handover."

Dragon is headed to port with ~4,100 pounds of scientific research and hardware for a cargo handover to @NASA.

— SpaceX (@SpaceX) January 13, 2018

Wires, plants and rodents

The International Space Station is effectively a floating research laboratory. It experiences microgravity while in orbit around the Earth, making it a unique environment for scientific study.

Research materials from three projects are being shipped back to Earth. A study of plants with low access to oxygen may help scientists improve the tolerance of crops to soil flooding. Observations of a special kind of glass could improve fiber optics in microgravity, while a study of mice has tested a tiny implantable drug delivery system.

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The Falcon Heavy rocket sits on its launchpad at the Kennedy Space Center in Florida. SpaceX/Public Domain

SpaceX next plans to launch its Falcon Heavy rocket. Touted by the company as the most powerful working rocket in the world, it is due to take off from the Kennedy Space Center in Florida.

The rocket will carry CEO Elon Musk's personal red Tesla Roadster car into space—that is, if it makes it off the ground at all. Musk himself thinks the rocket could explode on lift-off.

He told an audience at last year's International Space Station Research and Development conference in Washington, D.C: "I hope it makes it far enough away from the pad that it does not cause pad damage. I would consider even that a win, to be honest."