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December 18, 2007
- Prepping Explorer
- Launch Night Success
- NASA – Launch of Explorer
- Rocket Man: Wernher von Braun
- Explorer 1
- Mid-December Snowstorm in United States
- Mars: Closest Approach 2007
- NASA’s Dawn Spacecraft Begins Interplanetary Cruise Phase
- APOD: 2007 December 18 – Unusual Silica Rich Soil Discovered on Mars
- NASA – The Hubble Space Telescope Sees Mars’s Close Approach in 2007