Astronomy! Emily Cunningham Institut d’Astrophysique de Paris.

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Presentation transcript:

Astronomy! Emily Cunningham Institut d’Astrophysique de Paris

What do astronomers study?

1. Planets

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

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

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

5. The Universe: Cosmology

How do astronomers study the universe?

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

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

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

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

Thierry Cohen,

2. Theory: Computer Simulations!

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!

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

Pinwheel Galaxy: Visible Light (Hubble Space Telescope)

Pinwheel Galaxy: Infrared (Spitzer Space Telescope)

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

Pinwheel Galaxy: Infrared + Visible + X-ray

Elliptical Galaxies

Image: Hubble Space Telescope