Best Ever Q&A Space Mysterious Universe Solar System The Planets Moon Exploring the Heavens Space Travel Our World Nature History Science & Technology	Exploring the Heavens How did the Pioneer space probes work? Why is the Hubble Telescope in space? How does a modern telescope work? What did Giotto tell us about comets? How did early astronomers study the heavens? Where did the Voyager space probes go?   Previous: Back to Exploring the Heavens Book: Best Ever Q&A Section: Space Chapter: Exploring the Heavens