Credit: Alexx Mayes
Riding on the rocket's second stage was Elon Musk's Tesla Roadster, an electric vehicle with a dummy named "Starman" behind the wheel. After the launch, the car and its passenger spent nearly 6 hours orbiting the Earth on the rocket's second stage, or the upper portion of the rocket that is designed to deliver payloads into orbit. [In Photos: SpaceX's 1st Falcon Heavy Rocket Test Launch Success!]
At about 9:45 p.m. EST (0245 GMT), the rocket performed its third and final burn, which was supposed to send this dummy payload cruising by Mars in an elliptical orbit around the sun. (However, the rocket overshot its target and ended up on a path toward the asteroid belt instead.)
Shortly after the second stage initiated this burn, people in the western U.S. began reporting rocket sightings in the evening sky. While SpaceX has not officially confirmed that the images or videos on social media were of the Falcon Heavy, it was the only rocket scheduled to be flying over the Earth at that time and place, so it seems highly unlikely these spectators saw anything else.