Skip to main content

SpaceX may have finally zeroed in on cause of September’s rocket explosion

spacex rocket explosion cause boom
Image used with permission by copyright holder
An unprecedented fueling issue was behind the September explosion of a SpaceX rocket, according to CEO Elon Musk. The rocket — carrying Facebook’s Internet satellite for Africa — exploded on the launchpad during a test on September 1, confounding the company’s scientists and putting SpaceX in the crosshairs of a considerable amount of criticism.

Musk told CNBC’s Squawk Box on Friday that as liquid oxygen flowed into the second stage tank, it actually froze, causing a catastrophic failure. Getting oxygen to freeze solid is fairly difficult to do: the gas freezes at a temperature of -362 degrees Fahrenheit.

“I think we’ve gotten to the bottom of the problem,” Musk told CNBC. “Really surprising problem that’s never been encountered before in the history of rocketry.” He added it was the most difficult problem to solve in the company’s short 14-year history.

The explosion has caused a good deal of harm to SpaceX. The company was supposed to use one of its rockets to ferry supplies to the International Space Station this month, but that flight was canceled and not rescheduled. Instead, NASA is using a rocket from competitor OrbitalATK, with that launch scheduled for the spring.

SpaceX also has a contract to get astronauts to the SpaceX station starting as early as 2018, but that, too, might be in jeopardy without assurances that an incident like this does not happen again. The company’s engine design might prove problematic.

Liquid oxygen is cooled to a level that brings it just 22 degrees or so from its freezing point, about 40 degrees colder than traditional methods. While SpaceX says this improves thrust, it also requires that astronauts be in the launch vehicle before it is fueled. Traditionally, astronauts are held off the rocket until it is clear that fueling has occurred safely.

That’s gotten the attention of some officials. In December, retired Air Force Lt. Gen. Thomas P. Stafford, head of a space station advisory committee, slammed the plan, saying it was “contrary to booster safety criteria that has been in place for over 50 years, both in this country and internationally.”

Editors' Recommendations

Ed Oswald
For fifteen years, Ed has written about the latest and greatest in gadgets and technology trends. At Digital Trends, he's…
How to watch SpaceX Crew-4 astronauts launch to ISS
A SpaceX Falcon 9 rocket launching from Cape Canaveral.

NASA Live: Official Stream of NASA TV

NASA and SpaceX are making final preparations for the launch of four astronauts to the International Space Station (ISS) from Kennedy Space Center’s Launch Complex 39A. The Crew-4 astronauts were originally supposed to launch on Saturday, April 23, but due to the late departure from the ISS of the Ax-1 mission, the mission won't get underway until Wednesday, April 27, at the earliest.

Read more
Watch the splashdown of NASA’s first private ISS mission
watch the splashdown of nasas first private iss mission ax 1 homecoming

NASA’s first private mission to the International Space Station has ended successfully after the four-person crew splashed down in a SpaceX Crew Dragon capsule off the coast of Florida.

The four Ax-1 crewmembers -- Canadian investor and philanthropist Mark Pathy, American entrepreneur Larry Connor, former Israeli Air Force pilot Eytan Stibbe, and former NASA astronaut Michael López-Alegría -- came down in the Atlantic Ocean near Jacksonville, Florida, at 1:06 p.m. ET (10:06 p.m. PT) on Monday, April 25.

Read more
Check out this cool NASA image of SpaceX Crew-3’s ride home
A SpaceX Crew Dragon spacecraft docked at the ISS.

A stunning image shared by NASA shows the SpaceX Crew Dragon Endurance spacecraft at the International Space Station (ISS) just a few days before it brings home the Crew-3 astronauts.

Crew Dragon Endurance docked at the International Space Station about 250 miles above Earth. NASA

Read more