Seeing as I previously posted about Google Earth, I thought I should update with a post about NASA's open source World Wind tool. It's been around longer than Google Earth I believe, and has a lot more scientific focus - and it even includes the Moon! There are some great features looking at natural disasters, loading in real satellite pictures of cloud cover, simulating albedo changes and much more. The screenshot shows Hurricane Kate in 2003. I particularly enjoyed the Astrobiology Field Guide, which shows landmarks around the world where biologists have found life in unlikely places. The landmarks link to information pages on the NASA site explaining their significance.
NASA World Wind website (download the software here too)
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