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For reference's sake:

earth_scale.jpg

The Chicxulub asteroid is the one that may have wiped out the dinosaurs-- estimated at about 10km in diameter.

I took the base image from Wikipedia's size comparison of Ceres, but I think it slightly underestimates the diameter of the moon-- my notes say it should be about 120 pixels in diameter in that image (assuming Earth is about 441 pixels in diameter), and the actual image shows it around 116 or so.

DaveE

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