To arrange the key events regarding the exploration of space in the correct chronological order, we can refer to significant milestones in space exploration:
- First humans in space - Yuri Gagarin (1961)
- First humans on the Moon - Apollo 11 mission (1969)
- First space shuttle flight - STS-1 mission (1981)
- First lander on Mars - Viking 1 (1976)
- Hubble Space Telescope launch - 1990
- Last humans on the Moon - Apollo 17 (1972)
Based on these events, the correct chronological order from your options is:
first humans in space, first humans on the moon, first space shuttle flight.
So the correct response is: first humans in space, first space shuttle flight, first humans on the moon.