After years of anticipation, SpaceX is supposed to launch its first ever Falcon Heavy rocket today. SpaceX CEO Elon Musk wants to eventually use these rockets to send people to Mars. However, strong winds could put a dent in the company's plans.

Mary Beth Griggs, Assistant Editor at Popular Science, explains what's causing the delay. Even though the rocket is massive, slight changes to the weather could lead to disaster.

The Falcon Heavy rocket cost about $90 million to build. It is the largest rocket SpaceX has made so far, with 27 engines.