Photos: Delta 4 rocket fires off the pad before sunset

Calling on the Atlas 5 rocket to flex its muscles one more time, Orbital ATK will partner with United Launch Alliance once again to send a massive load of supplies to the International Space Station astronauts early next year.

The Falcon Heavy rocket was lowered to the horizontal position before sunrise Friday morning after less than a day standing at the launch pad.

Ziplines are used by thrill-seekers in adventures around the world, but now they are coming to the U.S. space program as the emergency escape system for personnel at Cape Canaveral’s Complex 41.