If it's for the general pooblic, how about:
Why do professional astronomers never look through telescopes?
What did Galileo do wrong?
Can spiders build webs in zero gravity?
What happens after the Hubble Space Telescope stops working?
What happened to poor old Pluto?
Where are we going to live on the Moon?
Why do some astronomers work underground?
What is a planisphere? (or, How do you find your way around the sky?)
? Something on aboriginal sky lore ?
What else? That's about it for the moment!
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