A historic day for US aerospace company SpaceX, which just launched the world's most powerful rocket. It's a milestone in space exploration efforts, but it wasn't without some initial uncertainty. CGTN's John Zarrella reports from the Kennedy Space Center in Florida.

JOHN ZARRELLA KENNEDY SPACE CENTER, FLORIDA It was a huge day here at the Kennedy Space Center for Elon Musk and his company SpaceX. Thousands of people crowded the area for what was built as a historic launch the first test flight of the Falcon Heavy rocket. And no one left disappointed.

And of course, this is built as the most powerful rocket in the world now, the Falcon Heavy. And it can lift payloads, both into lower orbit and go on to the moon and perhaps one day on the Mars. Not just with cargoes, but with human. And that greatly were reduced cost, that it was Elon Musk has been striving a deal. Bring down the cost of flying into space with usable boosters. How it does that? There was three of the core boosters, one center and two attached on the either side on the Falcon Heavy. Two of them were turned here the Kennedy Space Center, successful landings and the third was expected land, a supposed land off shore on a barge.

Now, so, from here where do they go? After the Falcon Heavy success down the road, it looks like by the end of this year, Elon Musk will try to fly the first crewed dragon spacecraft. That crewed because it will carry astronauts to the international space station. It will be another huge success if they can get back off the ground and perhaps even fly with astronauts before the end of the year. So a spectacular day here at the Kennedy Space Center and Elon Musk cherry-red Roaster, which was up in the ferrying is now on its way into deep space and eventually will be orbiting the sun. I'm John Zarrella CGTN America at the Kennedy Space Center, in Florida.