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