1. Astronomy! Emily Cunningham Institut d’Astrophysique de Paris

2. What do astronomers study?

3. 1. Planets

4. 2. Stars Image: NASA BLACK HOLE!SUPERNOVA! (NASA)

5. 3. Galaxies Andromeda Galaxy (M31). Image: NASA

6. 4. Clusters of Galaxies Abell Cluster of Galaxies. Image: NASA

7. 5. The Universe: Cosmology

8. How do astronomers study the universe?

9. How do astronomers study? 1. Observations: Telescopes 2. Theory: Computer Simulations and Models

10. Observations 1. Ground-Based Kitt Peak National Observatory, Arizona, United States

11. Observations 1. Ground-Based Keck Telescopes: Mauna Kea, Hawaii, United States

12. Observations 2. Space-Based Hubble Space Telescope (HST)

14. Thierry Cohen, www.newyorktimes.com

17. 2. Theory: Computer Simulations!

18. The Speed of Light  Speed of light: c = 3.00 x 10 8 m/s  Because light has a finite speed, the light that reaches us from distant objects was emitted many (i.e. millions or billions) years ago  This means, in astronomy, looking far away is the same as looking back in time!

19. Night vision goggles can see infrared! X-rays pass through your skin but not your bones!

20. Pinwheel Galaxy: Visible Light (Hubble Space Telescope)

21. Pinwheel Galaxy: Infrared (Spitzer Space Telescope)

22. Pinwheel Galaxy: X-Rays (Chandra X-Ray Observatory)

23. Pinwheel Galaxy: Infrared + Visible + X-ray

24. Elliptical Galaxies

26. Image: Hubble Space Telescope