"Apparently, there is a car in orbit around Earth," tweeted Elon Musk with a link to the live feed of the orbit with the sign 'Don't panic' on the car dashboard.
It took him years to send his car with his rocket into space.
46 year old Elon Musk is member of the so-called PayPal Mafia, the founders and former employees at PayPal.
They are the most notorious group in Silicon Valley who founded, funded or led some of the world’s biggest tech firms.
In 1999 he founded an online bank X.com, which later became PayPal.
In 2002 the online auction eBay bought it for 1.5 billion dollars.
In the same year Musk founded Space Exploration Technologies, or Space X, to make more affordable rockets.
In 2004 he became one of the major funders of Tesla Motors and in 2006 Tesla showed its first car, the Roadster.
Musk, who wants to colonise Mars, described the Falcon Heavy launch as "it’s kind of silly and fun, but I think that silly and fun things are important,"
Musk posted on his Instagram a photo of his note to aliens, with, 'Made on Earth by humans,' imprinted on the circuit board.
Big dreamer Musk has proven that science is fun with the Falcon Heavy returning to Earth, landing at SpaceX autonomous drone ship called 'Of Course I Still Love You'.
The company also has one called 'Just Read the Instructions.'
The launch generated a huge amount of interest online, and Mr Musk shared regular updates with his 18.9m followers.
US President Donald Trump congratulated Musk for the launch.
One of the best tweets came form Musk's competitor and another big dreamer Jeff Bezos.
In addition to launching Amazon, Bezos founded Blue Origin, a private space company that makes and launches reusable rockets with the ultimate goal of enabling millions of people to live and work in space.
Musk, not one to let an opportunity for humor pass, thanked Bezos for the well-wishes — and included a winking, kissing emoji.