Sarah Lewin, associate editor at, breaks down SpaceX's landmark 50th Falcon 9 launch. The rocket took off early Tuesday morning, launching a communications satellite into orbit.

Lewin says SpaceX reaching 50 launches with the Falcon 9 is a "pretty big" milestone. Lewin notes the satellite launched in this recent mission is nearly the size of a city bus.

Lewin also looks ahead to SpaceX's next Falcon Heavy launch which will take place in June. This launch is for the U.S. Air Force and will carry 25 satellites into orbit.