Big Questions About the UniverseHow big is space? Where does the universe end? And more thought provoking questions, answered. The questions in Big Questions About the Universe were curated by the staff at the Royal Observatory Greenwich, in London, to address all the most commonand a few uncommonthings that children want to know about the universe and about outer space. It covers a mixture of basic questions about planets, moons, human exploration, and the origins of the universe,