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April 21, 2009
- The Road to Apollo – Lunar Orbiter
- Pluto and its Moons: Charon, Nix, and Hydra
- Aracar Volcano, Andes Mountains
- A Terminator View from Mercury Flyby 2
- Rabe Crater Dunes
- Waves from Daphnis
- Sea Ice Ebbs and Flows
- Hubble Celebrates Its 19th Anniversary with a “Fountain of Youth”
- APOD: 2009 April 21 – Global Warming Predictions