Today's picture from the Tree of SCIENCE!!! is a two-fer:
That's a glass star and a wooden crescent moon, and together, obviously, they stand for astronomy and planetary science. Really, that's so easy and obvious that I don't need to say any more.
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Would you like to borrow my Star Trek ship ornaments? They'd complement that theme nicely. ;-)
Yes, but the moon has a face. Animism!
Star Trek ship ornaments? Look at the "moon" sideways. That's clearly a Romulan ship from "Balance of Terror"!
Rob, it looks more like a Ferengi ship to me!