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Nasa SpaceX launch: 10 questions about the mission

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Crew Dragon will become the first commercial spacecraft to carry humans to the space station
Elon Musk's company SpaceX is about to launch its space vehicle - the Crew Dragon - with astronauts onboard for the first time. Here, we answer some common questions about the mission.
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What is SpaceX?
SpaceX is an American company that provides commercial and government launch services on its Falcon 9 and Falcon Heavy rockets. Entrepreneur Elon Musk founded the company in 2002, with the goal of reducing space transportation costs, enabling the colonisation of Mars. SpaceX was the first private company to routinely return rocket stages to Earth under propulsive power so they could be re-flown rather than being discarded. It has been conducting regular flights of cargo to the ISS, and will now aim to begin launching astronauts. Musk's company is also developing a bigger spacecraft to carry humans - called Starship - which could begin the process of settling Mars.
The Crew Dragon will seat a maximum of four during Nasa missions to the ISS
Who is Elon Musk?
Born in South Africa, Elon Musk made more than $160m from the sale of online payment service PayPal to eBay. His desire to see humanity become a true space-faring civilisation was a driving factor behind the founding of SpaceX. But he has also been involved in founding a variety of other companies such as the electric car manufacturer Tesla. He also conceived a project called Hyperloop, a high-speed transportation system using pods that travel through a system of tubes. His colourful personality and lifestyle made him the inspiration for Robert Downey Jr's interpretation of Marvel Comics character Tony Stark. Musk is no stranger to controversy: his tweets have triggered lawsuits and led to him being forced out as the chairman of Tesla (though he remained as CEO).
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What is the Crew Dragon?
The Crew Dragon is the spacecraft that will transport astronauts to the ISS on Wednesday. It is a sleek evolution of the Dragon spacecraft which was built to ferry cargo to the orbiting outpost. The Crew Dragon is designed to carry a maximum of seven passengers, but Nasa flights will carry four, with the rest of the space taken up by supplies. It is equipped with thrusters that enable it to manoeuvre in space and will dock - or attach - to the space station under autonomous control. Unlike previous spacecraft designed for humans, the crew cabin features touchscreen controls in place of physical buttons.
A Crew Dragon during its first orbital test last year. The craft was not carrying humans on that occasion
Who are the astronauts flying to space?
Bob Behnken and Doug Hurley are Nasa astronauts. They were selected in 2000 and have each flown to space twice on the space shuttle. They are among the most experienced members of Nasa's astronaut corps and both trained as test pilots - which has been critical for putting the new spacecraft through its paces. Hurley has spent a total of 28 days and 11 hours in space, while Behnken has accumulated a total of 29 days and 12 hours, including 37 hours of spacewalking time. Both men are also married to astronauts.
Bob Behnken (L) and Doug Hurley arrived in Florida on 20 May to prepare for launch
What are the astronauts there to do?
Spacecraft designed to carry astronauts have to go through a process that ensures they can operate safely. This launch is essentially the final step in that validation process. Once in orbit, Behnken and Hurley will test the Crew Dragon's environmental control system, the displays and controls and the manoeuvring thrusters. They will monitor the autonomous docking system during the approach to the space station and will become members of the ISS crew. At the orbiting outpost, they will continue performing tests on the Crew Dragon along with other tasks related to the space station. When it's time to return to Earth, the Crew Dragon will parachute down into the Atlantic Ocean. The capsule and crew will then be recovered by a ship called Go Navigator.
What if something goes wrong during the launch?
The Crew Dragon has a built-in abort system, designed to save the lives of its crew in the event of an emergency. If there's a problem during lift-off, such as a rocket engine cut-off, the Crew Dragon will fire engines to propel the vehicle and its occupants free of the rocket. The capsule will then parachute down to safety. SpaceX successfully conducted a test of its in-flight abort system on 19 January 2020.
What about those spacesuits?
The flight suits that Behnken and Hurley will wear in the capsule look very different to previous designs. In stark contrast to the bulky pumpkin-coloured suits and round helmets familiar from the space shuttle era, SpaceX's suits are slimline, white, one-piece numbers with sleek, 3D-printed helmets. Each one is custom made for the astronaut. If they look like something from a science fiction movie, that's probably because their look was devised by Hollywood costume designer Jose Fernandez, who has worked on the Batman, X-Men and Thor movies. But the suits also have to be practical; they're designed to keep the crew alive in the event of a cabin depressurisation - where the air is lost from the inside of the spacecraft.
The flight suits are futuristic, but also have to be practical
What happens next?
If the Crew Dragon Demo-2 mission is successful, SpaceX will proceed with the six "operational" missions to the ISS they are required to fly under their $2.6bn contract with Nasa. Boeing holds a similar deal, worth $4.2bn, to transport crew to the space station using its CST-100 Starliner vehicle.Follow Paul on Twitter.
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