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Dr Nathan and his team survive the gravity inversion, they land on the Hollow Earth, which is situated below the Earth's surface: How does the Hollow Earth get sunlight?

In stories of a hollow Earth (Burroughs' Pellucidar and Mike Grell's Warlord comic, to name two) there is a small sun at the centre of the Earth. This could work if it had negative mass, hence repelling and being repelled by ordinary mass, explaining why there is outward-pointing gravity at the inner surface. (Of course, it doesn't fit in any way with seismic measurements of our planet, but for fantasy, it is an acceptable explanation.) Klaus Æ. Mogensen – Klaus Æ. Mogensen 2021-10-25 07:53:39 +00:00 Commented Oct 25, 2021 at 7:53

monsterverse - How does the Hollow Earth get sunlight? - Science Fiction & Fantasy Stack Exchange