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Astronomy! Emily Cunningham Institut d’Astrophysique de Paris.
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Transcript of Astronomy! Emily Cunningham Institut d’Astrophysique de Paris.
Astronomy!Astronomy!
Emily Cunningham
Institut d’Astrophysique de Paris
What do astronomers study?What do astronomers study?
1. Planets1. Planets
2. Stars2. Stars
Image: NASA
BLACK HOLE!SUPERNOVA! (NASA)
3. Galaxies3. Galaxies
Andromeda Galaxy (M31). Image: NASA
4. Clusters of Galaxies4. Clusters of Galaxies
Abell Cluster of Galaxies. Image: NASA
5. The Universe: Cosmology5. The Universe: Cosmology
How do astronomers study the How do astronomers study the universe?universe?
How do astronomers study?How do astronomers study?
1. Observations: Telescopes
2. Theory: Computer Simulations and Models
ObservationsObservations
1. Ground-Based
Kitt Peak National Observatory, Arizona, United States
ObservationsObservations
1. Ground-Based
Keck Telescopes: Mauna Kea, Hawaii, United States
ObservationsObservations
2. Space-Based
Hubble Space Telescope (HST)
Thierry Cohen, www.newyorktimes.com
Thierry Cohen, www.newyorktimes.com
2. Theory: Computer Simulations!2. Theory: Computer Simulations!
The Speed of LightThe 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!
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 GalaxiesElliptical Galaxies
Image: Hubble Space Telescope
Image: Hubble Space Telescope