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Previously unseen footage has emerged showing Elon Musk’s stunned reaction to the launch of Space X’s Falcon Heavy rocket.

A camera crew from National Geographic went behind-the-scenes to follow Musk and his team on the day of the launch of the world's most powerful rocket.

They captured the reaction of the billionaire business magnate and SpaceX owner during the countdown, before he proclaimed "holy flying f***, that thing took off" as it blasted into space.

Within seconds, he raced out the door of the launch control centre and shielded his eyes as he stared up at the sky.

He and staffers then pointed up as Musk called out: “Look at that! That's unreal."

The footage was filmed for the second season of MARS, which is returning to National Geographic later this year.

SpaceX Falcon launch - In pictures 14 show all SpaceX Falcon launch - In pictures 1/14 SpaceX Falcon Heavy rocket lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral AP 2/14 SpaceX Falcon Heavy rocket climbs towards space Reuters 3/14 Incredible footage shows the SpaceX Falcon Heavy rocket passing Earth AP 4/14 SpaceX's CEO Elon Musk Getty Images 5/14 SpaceX's gigantic Falcon Heavy rocket successfully blasted off from its launch pad SpaceX 6/14 SpaceX livestream video shows "Starman" sitting in SpaceX CEO Elon Musk's cherry red Tesla roadster after the Falcon Heavy rocket delivered it into orbit around the Earth 7/14 Incredible footage shows the SpaceX Falcon Heavy rocket in orbit AFP/Getty Images 8/14 Printed on the circuit board of a car in deep space 9/14 Incredible footage shows the SpaceX Falcon Heavy rocket in orbit AP 10/14 SpaceX Falcon Heavy rocket lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral AP 11/14 The crowd cheers at Playalinda Beach in the Canaveral National Seashore, just north of the Kennedy Space Center, during the successful launch of the SpaceX Falcon Heavy rocket AP 12/14 Visitors have staked out spots near to the fishing pier at Jetty Park to watch the rocket launch Reuters 13/14 SpaceX Falcon Heavy rocket lifts at Kennedy Space Center in Cape Canaveral AP 14/14 A red Tesla Roadster is seen during preparations to use it as a mock payload for the launch of a SpaceX Falcon Heavy rocket in Cape Canaveral, Florida REUTERS 1/14 SpaceX Falcon Heavy rocket lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral AP 2/14 SpaceX Falcon Heavy rocket climbs towards space Reuters 3/14 Incredible footage shows the SpaceX Falcon Heavy rocket passing Earth AP 4/14 SpaceX's CEO Elon Musk Getty Images 5/14 SpaceX's gigantic Falcon Heavy rocket successfully blasted off from its launch pad SpaceX 6/14 SpaceX livestream video shows "Starman" sitting in SpaceX CEO Elon Musk's cherry red Tesla roadster after the Falcon Heavy rocket delivered it into orbit around the Earth 7/14 Incredible footage shows the SpaceX Falcon Heavy rocket in orbit AFP/Getty Images 8/14 Printed on the circuit board of a car in deep space 9/14 Incredible footage shows the SpaceX Falcon Heavy rocket in orbit AP 10/14 SpaceX Falcon Heavy rocket lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral AP 11/14 The crowd cheers at Playalinda Beach in the Canaveral National Seashore, just north of the Kennedy Space Center, during the successful launch of the SpaceX Falcon Heavy rocket AP 12/14 Visitors have staked out spots near to the fishing pier at Jetty Park to watch the rocket launch Reuters 13/14 SpaceX Falcon Heavy rocket lifts at Kennedy Space Center in Cape Canaveral AP 14/14 A red Tesla Roadster is seen during preparations to use it as a mock payload for the launch of a SpaceX Falcon Heavy rocket in Cape Canaveral, Florida REUTERS

Falcon Heavy - the world's most powerful rocket - made history last week as it blasted off from the Kennedy Space Centre in Florida in front of cheering crowds.

It was fitted with a camera that allowed the public to watch a live stream of its journey through space from earth.

Amazing footage showed Musk’s cherry red Tesla roadster - which is attached - pass Earth during its mission to Mars.

Despite the rocket missing its Mars orbit and shooting off towards an asteroid field, Musk urged other rocket companies to join him in a “new space race” as he boasted of his latest mission using the biggest and most powerful rocket ever to leave Earth.

And he has now said the timeline for reaching the Red Planet has been brought forward as he laid out plans to test a new even bigger "beast" rocket next year.

The mammoth launch sparked some criticism with Flat Earth conspiracy theorists claiming it was faked.

While, former NASA deputy director Lori Garver branded the historic moment a “gimmick”.