The Australian aerospace firm Gilmour Space has again delayed the launch of its Eris 1 rocket, the country's first orbital rocket.

SpaceX launched its first Falcon 9 rocket on June 4, 2010. Since then it has gone through five major revisions, leading to the current Block 5 model that is used to launch satellites, robotic planetary missions and astronauts. The most launched U.S. rocket in history, of its 500th missions, all but five were successful.

SpaceX will ring in July with a doubleheader launch day. Here's what to know about the two rocket launches coming up.