Britannica astronomer Dean Regas offers kids illustrated guidance for kids on helping stubborn adults in their lives start recognizing that Pluto is not actually a planet. Reveals the latest planetary discoveries and updates to astronomy that parents and adults may not know about yet--like the search for exoplanets as well as how Pluto and others have become classified as dwarf planets.

Welcome to space -- Earth's a planet? That's revolutionary -- Geocentric vs. heliocentric -- Where is Uranus? -- Planets found and kicked out -- Finding a planet without even looking -- Search for Planet X -- Pluto found in pictures -- How Planet X got its name -- Pluto the shrinking planet -- Pluto the eccentric planet -- Pluto's long-lost brothers and sisters -- Pluto's siblings: not planets -- Pluto: not a planet in New York -- So, what is a planet? -- What astronomers meant to say -- Space object classification guide! -- What is Pluto, then? -- Fast facts about Pluto -- Postcard from Pluto -- What to do if your grown-ups fight back -- Moons in the solar system -- Nature of science -- Number of planets through history -- Introducing ... Sedna -- Fast facts about Sedna -- Planet nine -- The new and improved solar system -- Time line of discovery -- What type of solar system object are you? -- Test your grown-ups!.