1. Astronomy The Study of Stars, Galaxies, Planets, and More

2. The Solar System

3. The Sun is a star. Center of the Solar System 109 x bigger than Earth ~12,000°F

4. Special telescopes can look at the Sun. They are called “solar telescopes.”

5. The Sun can have dark areas called sunspots.

6. The Solar System

7. The Inner Planets Mercury Venus Earth Mars

8. The Inner Planets MercuryVenus EarthMars

9. The Outer Planets Jupiter Saturn Uranus Neptune

10. The Outer Planets UranusJupiterSaturn Neptune

11. Lots of planets have moons. Two of these object are NOT moons.

12. Other things in the solar system: Asteroids

13. Asteroids are not potatoes.

14. Other things in the solar system: Comets

15. Comets have tails. Comets are like dirty snowballs

16. Stars

17. Stars are like the Sun but very far away.

18. Blue stars are hot. Red stars are cool.

19. The Pleiades is a young star cluster, not a constellation.

20. This an old star cluster called M80.

21. Horsehead Nebula and Flame Nebula Clouds of gas and dust in space are called “nebulae”.

22. Orion NebulaEagle Nebula Stars are born in these nebulae.

23. Cat’s Eye NebulaButterfly Nebula These nebulae are from dying stars.

24. Galaxies

25. Stars and dust make up galaxies. Our galaxy is the Milky Way.

26. This is what the Milky Way Galaxy looks like if you didn’t have the Earth in the way.

27. A model of the Milky Way. Milky Way rotates this way.

28. This is the Whirlpool Galaxy. It also has spiral arms.

29. EllipticalSpiral Galaxies come in different types Irregular

30. Galaxies come in groups called clusters. This is the Virgo Cluster.

31. Groups of galaxies form a 3D web in the Universe.