Which list gives key events regarding the exploration of space in the correct order, beginning with the earliest?

Answer 1

1. Launch of Sputnik 1 in 1957
2. First human spaceflight by Yuri Gagarin in 1961
3. Apollo 11 moon landing in 1969
4. Launch of Hubble Space Telescope in 1990
5. Mars rover mission starting in 1997
6. Launch of International Space Station in 1998