Humans have colonized the moon. Looking down on Earth during a solar eclipse, a grandfather tells his two grandchildren, born on the Moon, about Earth. Stories about water, clouds, and ice—things they have never experienced on the Moon—with a historical perspective involving dinosaurs, mammoths, volcanoes, and the forming of great canyons.
Set on the surface of the Moon in the year 2081, a grandfather and granddaughter watch a solar eclipse from scenic cliffs overlooking their moon colony. Conversation leads to contrasts between the moon, the only home the granddaughter knows, and the Earth, where the grandfather has spent most of his life.