Live SpaceX Launch: Latest Updates

When is the launch, and how can I watch it?

On Wednesday, for the first time since the retirement of the space shuttles in July 2011, NASA astronauts are scheduled to blast off from American soil on an American rocket to the International Space Station. In contrast to astronaut launches in the past when NASA ran the show, this time a private company, SpaceX, will be in charge of mission control. The company, founded by Elon Musk, built the Falcon 9 rocket and the capsule, Crew Dragon, which the two astronauts will travel in.

The mission is scheduled to lift off at 4:33 p.m. Eastern time from the Kennedy Space Center in Florida. Coverage of the launch on NASA Television will be begin at 12:15 p.m. The Times will also provide a live video of the launch.

However, weather forecasts for the afternoon looked grim with rain likely around Kennedy Space Center. In addition,

But because people are flying to space, the weather has to be good in two places: at the launch site and in the long swath of ocean — along the East Coast and then across the North Atlantic to nearly Ireland — where the astronauts might splash down in an emergency. A tropical storm, Bertha, formed off South Carolina, which might churn up choppy waves in the Atlantic where the capsule would need to be recovered in an emergency.

If the launch is postponed, SpaceX and NASA can try again on Saturday at 3:22 p.m. and Sunday at 3 p.m., with a 60 percent chance of being able to begin the mission on either of those days.

They both have backgrounds as military test pilots and have each flown twice previously on space shuttle missions, although this is the first time they have worked together on a mission. Mr. Hurley flew on the space shuttle’s final mission in 2011.

In 2015, they were among the astronauts chosen to work with Boeing and SpaceX on the commercial space vehicles that the companies were developing. In 2018, they were assigned to the first SpaceX flight.

What are they flying in?

SpaceX has never taken people to space before. Its Crew Dragon is a gumdrop-shaped capsule — an upgraded version of SpaceX’s original Dragon capsule, which has been used many times to carry cargo, but not people, to the space station.

Crew Dragon has space for up to seven people but will have only four seats for NASA missions. If this launch succeeds, it will ferry four astronauts to the space station later in the year.

When will the astronauts arrive at the space station?

The Crew Dragon is scheduled to arrive at the International Space Station 19 hours after launch, at about 11:39 a.m. Eastern time. That time will allow the astronauts to test how the spacecraft flies and verify that the systems are performing as designed. Unless something goes wrong, the Crew Dragon’s computers usually handle all of the maneuvering and docking procedures.

The astronauts also said they planned to test out the capsule’s toilet.

If the launch is delayed to the weekend, the trip to the space station will take longer, more than 30 hours, because of the orbital path the capsule will need to take to catch up with the space station.

How long will they stay and what will they do?

Originally, Mr. Behnken and Mr. Hurley were scheduled to stay at the space station for only two weeks. But those plans were made when NASA thought the mission would fly in 2019. With delays in the development of Crew Dragon and another capsule, Boeing’s Starliner spacecraft, NASA ran out of available seats aboard Russia’s Soyuz capsule to the space station. It now finds itself short-handed there, with only one NASA astronaut, Christopher J. Cassidy, currently on the station with two Russian counterparts.

Thus, Mr. Behnken and Mr. Hurley are now expected to stay at the station at least a month to help Mr. Cassidy. Mr. Behnken has trained to perform spacewalks, and Mr. Hurley took refresher classes on how to operate the station’s Canadian-built robotic arm.

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