1. One more orbital maneuver is planned April 24.

2. When opposition occurred May 22, Mars was still approaching Earth on its orbital track, and will not reach minimum distance to Earth until May 30.

3. SpaceX is the only one ever to land the stages left over from orbital missions.

4. The two stars take just six hours to complete one orbital cycle.

5. All but Russia are new to such long orbital hauls.

6. Mastracchio, who stuffed the part into a trash bag to prevent it from becoming orbital debris.

7. It was the first time SpaceX founder Elon Musk tried to fly a booster that soared before on an orbital mission.

8. The proposal also included an additional 7,518 satellites in orbital planes even closer to the ground.