SpaceX marked a milestone today (June 25) as the company's Falcon Heavy megarocket successfully lofted two dozen satellites into orbit.

A Russian cosmonaut and astronauts from the United States and Canada returned to Earth after spending more than 200 days on board the International Space Station.

SpaceX is waiting until late in its 4-hour window to fire the engines on the massive Falcon Heavy rocket currently sitting on a launch pad here at Kennedy Space Center.

Here's a guide to SpaceX's launch schedule, other rocket missions, astronomical events of the next year, as well as milestones for spacecraft already in travel.

A panoply of satellites is awaiting liftoff aboard a Falcon Heavy rocket on a mission that will mark a milestone in SpaceX's quest to become an Air Force-certified launch provider.