“First things first: that big round circle in the sky isn’t really the sun. We just wish it could be the sun, I guess. But no. It’s a passageway. Only bright because the Earth is bright. Dark because the Earth is dark. And vast because …” He pointed at me. “Because the Earth is vast?” “That’s right. Guess what else the Earth is.” “A spheroid with a core of iron.” “Uh. Correct. But I was hoping for the word moving. The sunny passage rises in the morning and sets in the evening because, like the Earth, our world is always moving. And that makes things tricky. During our journey, everything has
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