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The rocket, which was contracted by NASA but owned by Orbital Sciences, was carrying supplies for the International Space Station, multiple science experiments, and satellites.
Here’s another amateur video from the distant press site, which shows the true immensity of the explosion.
ANTARES EXPLODES!!! Panic at the press site! Orbital’s rocket blows up
ANTARES EXPLODES!!! Panic at the press site! Orbital’s rocket blows up and destroys Cygnus Orb-3