Includes bibliographical references (p. 62) and index.

Telescopes -- What is a telescope? -- Who invented the telescope? -- What is an optical telescope? -- How do optical telescopes "see"? -- Where are the largest optical telescopes on Earth? -- What is a radio telescope? -- What is an infrared telescope? -- What is an ultraviolet telescope? -- What are X-ray and gamma-ray telescopes? -- What is an observatory? -- What is the Hubble space telescope? -- How does Hubble stay in orbit? -- Why is Hubble so important? -- Space probes -- What is a space probe? -- What do space probes do? -- What can space probes do that astronauts can't? -- Where did early space probes go? -- When did space probes reach Mercury, Venus, and Mars? -- Which other probes have studied Mars? -- Which rovers have explored Mars? -- What did the Phoenix lander discover on Mars? -- What have the voyager probes taught us about the solar system? -- Which probes have studied Jupiter? -- Which probe is studying Saturn? -- What have we learned from probes to the sun? -- What have we learned from stardust and near? -- What messages have we sent into space? -- What is "space junk"?

"An introduction to the history of telescopes and space probes for primary and intermediate grade students with information about their features and use. Includes a list of highlights for each chapter, fun facts, glossary, resource list, and index"-- Provided by publisher.