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| 1981: | |
| 1982: | |
| 1983: | |
| 1984: | |
| 1985: | |
| 1986: | |
| 1987: | Signing of the Intermediate-Range Nuclear Forces Treaty (INF) |
| 1988: | International spacecraft Phobos 2 launched to study Phobos, one of Mars' two moons |
| 1989: | Voyager 2 visits Neptune |
| 1990: | Magellan spacecraft enters an orbit around Venus |