NASA and SpaceX remained tight-lipped Thursday about what caused a mysterious but apparently serious incident last weekend during engine tests on the Crew Dragon capsule designed to carry US astronauts to the International Space Station (ISS) later this year.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/1-thecrewdrago.jpg)
Source:
https://phys.org/news/2019-04-spacex-nasa-tight-lipped-crew-capsule.html