A voice boomed out and talked about dark matter, which is a substance they know nothing about but that seems to bind objects in space into some kind of rhythm with each other. You can see the objects, but you can’t see the dark matter. The dark matter is the mystery, and yet everything depends on it—you can’t see it, but it drives everything into motion. “What was your favorite part, Dad?” Solly asked as they left. “I liked how he said that wherever you were in space, it felt like you were the center. I really related to that.” “Like as a planet?” Toby laughed. “I liked the fact that you can’t
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