Adapting a book named after a physics problem into a TV show meant to entertain the masses is both an admirable challenge and an invitation for disaster. Cixin Liu’s “Remembrance of Earth’s Past” trilogy has sold millions of copies around the world. Clearly, readers are connecting with something inside the former engineer’s weighty tomes about Earth’s first encounter with extraterrestrial life — and it likely isn’t the orbital mechanics. The colossal scale, galaxy-spanning stakes, and relatable characters all serve as emotional anchors that can hook people, and they all serve as key, replicable facets for a TV adaptation, too. What’s a bit harder to picture are casual fans scooting to the front of their seats for detailed explanations of interstellar travel and multi-dimensional theory. But hey, that’s the gig. You can’t say David Benioff and D.B. Weiss went into “3 Body Problem” unaware.