class 3: astronomy 101€¦ · 4 our cosmic address how do we know? who is responsible? early...
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Very Large Array (VLA)Soccoro, NM
Class 3: Astronomy 101Class 3: Astronomy 101
Where are we in the universe?
Planet?
Star-orbiting system?
Galaxy?
Cluster Group?
Supercluster?
Universe?
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Our Cosmic Address
Our Cosmic Address
Our Cosmic Address
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Our Cosmic Address
Our Cosmic Address
Our Cosmic Address
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Our Cosmic Address
How do we know? Who is responsible?
Early Astronomers
• 500 BC Pythagoras - thought Earth was round from moon observations
• 350 BC Aristotle - Earth at center of “universe”, planets/stars moved around Earth
• 250 BC Aristarchus - measured (relative) distance to Sun & moon using angles; Sun very BIG; at center of “universe”
• 200 BC Eratosthenes - measured size of the Earth using angles of sun at noon at 2 places
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PythagorasAristotle
Aristarchus Eratosthenes
500 250 0 250 1500 1600 1700 1800 1900
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Ptoo bad for Ptolemey
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PythagorasAristotle
Aristarchus Eratosthenes Ptolemy
500 250 0 250 1500 1600 1700 1800 1900
Crazy (but not really) Copernicus
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PythagorasAristotle
Aristarchus Eratosthenes Ptolemy Copernicus
500 250 0 250 1500 1600 1700 1800 1900
Galileo the Great
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PythagorasAristotle
Aristarchus Eratosthenes Ptolemy Copernicus Galileo
500 250 0 250 1500 1600 1700 1800 1900
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Keeping up with Kepler
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PythagorasAristotle
Aristarchus Eratosthenes Ptolemy Copernicus Galileo
Kepler
500 250 0 250 1500 1600 1700 1800 1900
Kepler Law # 1
Planets orbit the Sun in ellipses with Sun at one focus
circle ellipse focus
xxx xx
time to go from C D = time to go from A B
Kepler Law # 2
C Dclosest to suntravels fastest
A Bfurthest from suntravels slowest
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Kepler Law # 3
orbital period orbital radius
€
≈
• Percival Lowell (1855 - 1916 A.D.) - observed canals on Mars
Modern Astronomers
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PythagorasAristotle
Aristarchus Eratosthenes Ptolemy Copernicus Galileo
Kepler
• Carl Sagan (1934 - 1996 A.D.) - discovered hot, dense atmosphere on Venus - lead many searches for extra-terrestrial life
• Eugene & Carolyn Shoemaker - Eugene: linked Earth and moon craters to asteroid impacts - Carolyn: discovered more comets (32) than any other person
Lowell SaganShoemakers
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What is a wave?
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Light (electromagnetic) waves
medium waves = visible
Light (electromagnetic) waves
Tools of Astronomy(telescopes)
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Main functions of optical telescopes?
Radio Telescopes
light in
What do radio telescopes do?
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Where should they go?
Telescopes and Observatories(you should visit)