CAPE CANAVERAL, Fla. (AP) — SpaceX's big new rocket blasted off Tuesday on its first test flight, carrying a red electric sports car aiming for an endless road trip past Mars.

The Falcon Heavy rose from the same launch pad used by NASA nearly 50 years ago to send men to the moon. With liftoff, the Heavy became the most powerful rocket in use today, doubling the liftoff punch of its closest competitor.

For SpaceX, the private rocket company run by Elon Musk, it was a mostly triumphant test of a new, larger rocket designed to hoist supersize satellites as well as equipment to the moon, Mars or other far-flung points. For the test flight, a red sports car made by another of Musk's companies, Tesla, was the unusual cargo, enclosed in protective covering for the launch.

The three boosters and 27 engines roared to life at Kennedy Space Center, as thousands watched from surrounding beaches, bridges and roads, jamming the highways in scenes unmatched since NASA's last space shuttle flight. At SpaceX Mission Control in Southern California, employees screamed, whistled and raised pumped fists into the air as the launch commentators called off each milestone. Millions more watched online, making it the second biggest livestream in YouTube history.

Viewers were left with video images beamed from space of Musk's red Roadster circling the blue planet after the protective covering had dropped away and exposed the car. A space-suited mannequin was at the wheel, named "Starman" after the David Bowie song.

"It's kind of silly and fun, but I think that silly and fun things are important," said the SpaceX chief who also runs Tesla and is keen to colonize Mars. "The imagery of it is something that's going to get people excited around the world."

Two of the boosters— both recycled from previous launches — returned minutes after liftoff for on-the-mark touchdowns at Cape Canaveral. Sonic booms rumbled across the region with the vertical landings.

Musk later revealed the third booster, brand new, slammed into the Atlantic at 300 mph and missed the floating landing platform, scattering shrapnel all over the deck and knocking out two engines.

He was unfazed by the lost booster and said watching the other two land upright probably was the most exciting thing he's ever seen.

Before liftoff, "I had this image of just a giant explosion on the pad, a wheel bouncing down the road, the Tesla logo landing somewhere," he said. "But fortunately, that's not what happened."

Musk's rocketing Roadster is shooting for a solar orbit that will reach all the way to Mars.

Ballast for a rocket debut is usually concrete — "so boring," Musk said in a post-launch news conference.

The Roadster was anything but. Cameras mounted on the car fed stunning video of "Starman" tooling around Earth, looking something like a NASCAR racer out for a Sunday drive, with its right hand on the wheel and the left arm resting on the car's door.

A sign on the dashboard read: "Don't panic!" Bowie's "Life on Mars?" played in the background at one point. A Hot Wheels roadster was also on the dash with a tiny spaceman on board.

The Falcon Heavy is a combination of three Falcon 9s, the rocket that the company uses to ship supplies to the International Space Station and lift satellites. SpaceX is reusing first-stage boosters to save on launch costs. Most other rocket makers discard their spent boosters in the ocean.

Unlike most rockets out there, the Falcon Heavy receives no government funding. The hulking rocket is intended for massive satellites, like those used by the U.S. military and communication companies. Even before the successful test flight, customers were signed up.

"It was awesome like a science fiction movie coming to reality," said former NASA deputy administrator Dava Newman, Massachusetts Institute of Technology's Apollo professor of astronautics. "They nailed it. Good for them."

Given the high stakes and high drama, Tuesday's launch attracted huge crowds not seen since NASA's final space shuttle flight seven years ago. While the shuttles had more liftoff muscle than the Heavy, the all-time leaders in both size and might were NASA's Saturn V rockets, which first flew astronauts to the moon in 1968.

On the eve of the flight, Musk said the company had done all it could to maximize success. Musk has plenty of experience with rocket accidents, from his original Falcon 1 test flights to his follow-up Falcon 9s, one of which exploded on a nearby pad during a 2016 ignition test.

"I've seen rockets blow up so many different ways, so, yeah, it's a great relief when it actually works," Musk said after liftoff.

Not counting Apollo moon buggies, the Roadster is the first automobile to speed right off the planet.

The car faces considerable speed bumps before settling into its intended orbit around the sun, an oval circle stretching from the orbit of Earth on one end to the orbit of Mars on the other. It has to endure a cosmic bombardment during several hours of cruising through the highly charged Van Allen radiation belts encircling Earth. Finally, a thruster has to fire to put the car on the right orbital course. The car battery was expected to last for about 12 hours after liftoff.

If it weathers all this, the Roadster will reach the vicinity of Mars in six months, Musk said. The car could be traveling between Earth and Mars' neighborhoods for a billion years, according to the high-tech billionaire.

"Maybe discovered by some future alien race, thinking what were you guys doing? Did they worship this car? Why did they have a little car? That will really confuse them," Musk said.

Musk acknowledged the Roadster could come "quite close" to Mars during its epic cruise, with only a remote chance of crashing into the red planet.

Also on board in a protected storage unit is Isaac Asimov's science fiction series, "Foundation." A plaque contains the names of the more than 6,000 SpaceX employees.

The Heavy already is rattling the launch market. Its sticker price is $90 million, less than one-tenth the estimated cost of NASA's Space Launch System megarocket in development for moon and Mars expeditions.

SpaceX has decided against flying passengers on the Heavy, Musk said, and instead will accelerate development of an even bigger rocket to accommodate deep-space crews. His ultimate goal is to establish a city on Mars.

"If people think we're in a race with the Chinese, this is our secret weapon: the entrepreneurship of people like Elon and others like Jeff Bezos," said Stanford University's G. Scott Hubbard, NASA's first Mars czar.

Amazon's Bezos heads Blue Origin, which is developing a big, reusable orbital-class rocket and already is making suborbital flights in Texas.

"Woohoo!" Bezos said in a congratulatory tweet.

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AP Science Writer Seth Borenstein in Washington contributed to this report.

Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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