When Falcon Heavy lifted off, it became the most powerful operational rocket in the world by a factor of two.  With the ability to lift into orbit nearly 64 metric tons (141,000 lb)---a mass greater than a 737 jetliner loaded with passengers, crew, luggage and fuel--Falcon Heavy can lift more than twice the payload of the next closest operational vehicle, the Delta IV Heavy, at one-third the cost.

Following liftoff, the two side boosters separated from the center core and returned to landing site for future reuse.  

Falcon Heavy put a Tesla Roadster and its passenger, Starman, into orbit around the sun. At max velocity Starman and the Roadster will travel 11 km/s (7mi/s) and travel 400 million km (250 million mi) from Earth.

The hashtag #aliens trended on Twitter, and people called into TV stations reporting UFO sightings.