Learn how the constellations were named and how the stars change over millions of years. Discover how scientists are always increasing their knowledge of the stars.

Can I see all the stars in the sky? -- What are constellations? -- How do people use constellations? -- What is a star made of? -- How far away are the stars? -- How are stars made? -- How long do stars shine? -- How will the stars end their lives? -- How do we study stars? -- Fact file -- Glossary.