What is a galaxy? -- What are galaxies made of? -- What galaxy are we in? -- What is the shape of the Milky Way galaxy ? -- How big is the Milky Way? -- Where is our solar system in the Milky Way? -- How did our solar system form in the Milky Way? -- What is the Milky Way's neighborhood like? -- How did galaxies form? -- Does the Milky Way rotate? -- What are some other types of galaxies? -- Can galaxies run into each other? -- What is special about the Milky Way? -- What is the universe? -- How old is the universe? -- What was the Big Bang? -- How did scientists discover the universe is expanding? -- Is the universe still expanding? -- Why does it matter if the universe is expanding? -- How have we learned so much about the universe? -- How much of the universe can we see? -- What kinds of instruments do astronomers use? -- What is dark matter? -- What are black holes? -- What are star clusters? -- What are pulsars? -- Could life exist elsewhere in the universe? -- How will the universe end? -- Fun facts about the universe!.