SpaceX rocket explodes after launch.

-It wasn't clear what caused the rocket, named Dragon, to fail. SpaceX will conduct an investigation overseen by the Federal Aviation Administration.

It was the third resupply mission to fail in recent months. The three astronauts on the space station have about four months worth of supplies, according to NASA.

Sunday's flight was carrying more than 2 tons of goods, including 1,500 pounds of food and provisions for the crew.


                                                   
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