How big is the biggest star?
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This hi-res photo from the rings of Saturn shows the Earth in frame, to scale. We are so tiny. Besides, the title to this article is kind of funny.
Khan Academy lesson resources on the Scale of the Universe
How the Universe Got Bigger as We Measured It
This is the coolest website ever. It's called The Scale of the Universe 2.
Douglas Adams, Author of "The Hitchhiker's Guide to the Galaxy"