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Astronomy!. Emily Cunningham Institut d’Astrophysique de Paris. What do astronomers study?. 1. Planets. 2. Stars. SUPERNOVA! (NASA). BLACK HOLE!. Image: NASA. 3. Galaxies. Andromeda Galaxy (M31). Image: NASA. 4. Clusters of Galaxies. Abell Cluster of Galaxies. Image: NASA.

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Astronomy

Astronomy!

Emily Cunningham

Institutd’Astrophysique de Paris




2 stars
2. Stars

SUPERNOVA! (NASA)

BLACK HOLE!

Image: NASA


3 galaxies
3. Galaxies

Andromeda Galaxy (M31). Image: NASA


4 clusters of galaxies
4. Clusters of Galaxies

Abell Cluster of Galaxies. Image: NASA




How do astronomers study
How do astronomers study?

  • Observations: Telescopes

  • Theory: Computer Simulations and Models


Observations
Observations

  • Ground-Based

Kitt Peak National Observatory, Arizona, United States


Observations1
Observations

  • Ground-Based

Keck Telescopes: Mauna Kea, Hawaii, United States


Observations2
Observations

2. Space-Based

Hubble Space Telescope (HST)





The speed of light
The Speed of Light

  • Speed of light: c = 3.00 x 108 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!









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