http://www.ktvz.com/news/nasa-rocket-explodes-shortly-after-launch/29392528
 
Fortunately, it was unmanned. 

Video:
http://abcnews.go.com/Technology/video/rocket-explosion-video-nasa-launch-caught-tape-supply-26525806
Wow! Near total loss of thrust.
I'm not familiar with the Antares, but it looks like an LOX platform, based on the plumes.
My guess is a fuel line ruptured. She's dumping fuel, and it's not getting to the engine(s).
I saw plenty of launches when I lived in Cocoa Beach, but I never saw anything like that.

This was supposed to launch the day before.....    we went outside to watch, and in addition, just a few minutes later, the ISS came over..... nice passing....  but the rocket launch got scrubbed due to a boater getting into the restricted zone....  well, at least we saw the station.
 
Yesterday, we went outside again to watch....and waited.... my wife had the video stream on the computer and when we didn't see it at the expected time, she went to check to see if it was scrubbed again..... that's when we found it there was a problem.
 
Just goes to show we still haven't gotten that whole rocket/space thing figured out perfectly yet.

That's what they get for using generic Viagra.

No I think they contracted with 7up.

Just saw this. Figures that a rocket design that was put into service in 1957 (Atlas) would work but the more recent, 2013, Antares couldn't get off the launch pad.

Doc_Hollingsworth
Just saw this. Figures that a rocket design that was put into service in 1957 (Atlas) would work but the more recent, 2013, Antares couldn't get off the launch pad.

Yes. Too bad they no longer have Wernher von Braun huh?
 
J

Guitarhacker
Just goes to show we still haven't gotten that whole rocket/space thing figured out perfectly yet.

All of a sudden a mix seems so simple.

It is an interesting question whether this was a NASA rocket or not. Traditionally, NASA has assembled its own launch vehicles using components from private contractors which it specified and supervised closely. This rocked seems to have been assembled entirely by an independent company, using surplus Soviet rocket engines in addition to other parts. 

I can't remember which astronaut said, when asked what he was thinking just prior to launch, paraphrasing, "That I'm sitting on top of a rocket with over 400,000 components, all made by the lowest bidder".