Here’s the chronological order of the events in space exploration you mentioned:
- First artificial satellite - Sputnik 1 (Launched by the Soviet Union on October 4, 1957)
- First American into space - Alan Shepard (Launched on May 5, 1961)
- First manned moon landing - Apollo 11 (Lunar landing on July 20, 1969)
- Voyager twin missions into space (Voyager 1 launched on September 5, 1977; Voyager 2 launched on August 20, 1977)
- Skylab is launched (Launched on May 14, 1973)
- Mars Spirit Rover landing (Landed on January 4, 2004)
- Space Shuttle launch (The first Space Shuttle flight, STS-1, launched on April 12, 1981)
So the timeline in order is:
- Sputnik 1
- Alan Shepard
- Apollo 11
- Voyager twin missions
- Skylab
- Space Shuttle launch
- Mars Spirit Rover landing