checklist.md
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### Solar System Exploration, 1950s – 1960s
- [X] Mercury
- [X] Venus
- [X] Earth (Orbit/Moon)
- [X] Mars
- [ ] Jupiter
- [X] Saturn
- [X] Uranus
- [ ] Neptune
- [ ] Comet Haley
Solar System Exploration, 1950s – 1960s
- Mercury
- Venus
- Earth (Orbit/Moon)
- Mars
- Jupiter
- Saturn
- Uranus
- Neptune
- Comet Haley