Today is a sad day for future space exploration. A supply mission of SpaceX to the International Space Station ended in catastrophic failure a little over two minutes after launch. The unmanned vehicle exploded. Here is a tweet from Musk, the CEO of SpaceX:

SpaceX was planning on starting manned missions by 2017. Whatever the failure was today, I suspect that the 2017 date will now be pushed out. I was rooting for the success of SpaceX. This is a major setback for them.

Here is the video of the event. The silence at the end is deafening: