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December 21, 2009
- NASA Showcases Next International Space Station Component
- Gullies on Argyre Basin
- Rotations by Spirit’s Right-Front Wheel, Sol 2117
- Brightness Bucks the Dark
- Cloud Formations and Sunglint, Italy
- Soufriere Hills Volcano Resumes Activity
- Snowstorm Hits the U.S. East Coast
- Fresh Copernican Crater
- APOD: 2009 December 21 – Star Cluster R136 Bursts Out