NASA is going after an asteroid this week like never before.
A massive fireball and explosion erupted Thursday at SpaceX's main launch pad, destroying a rocket as well as a satellite that Facebook was counting on to spread internet service in Africa.
SpaceX said Friday that evidence points to a large breach in the rocket's helium system during a routine prelaunch test that turned into a devastating fireball three weeks ago.
A space station supply mission by a Virginia company has been pushed back to October.
SpaceX chief executive Elon Musk is calling last week's launch pad accident the "most difficult and complex failure" in the company's 14-year history.