Astronomy 1050 Summer 2013 What is Astronomy??? Do you think of Astrology??? The position of the sun, stars, moon and planets at the time of people's birth is said to shape their personality, affect their romantic relationships and predict their economic fortunes, among other divinations .
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Astronomy 1050 Summer 2013
What is Astronomy???
Do you think of Astrology???
The position of the sun, stars, moon and planets at the time of people's birth is said to shape their personality, affect their romantic relationships and predict their economic fortunes, among other divinations.
What is an specific prediction?
Fortune Cookies???
Are your fortunes accurate???
“You will run into money today”
• Did you literally run into a gold brick wall?
• Maybe you picked up a penny on the side walk…
• OR, maybe you picked up the penny because of your fortune
A specific prediction is rarely accurate while a vague one is rarely wrong.
Science makes specific Prediction:
• Can be quantitatively verified
Demonstration!
What happens when you drop an apple and a feather in a vacuum?
A. The ball will drop faster
B. The feather will drop faster
C. They will reach the bottom at the same time
D. Both will fly out into space!
Physics Predicts:
F=ma F=m𝐺𝑀
𝑟2
a = GM/r2
***Acceleration is independent of object
Astronomy
What is Astronomy???
Physics
• Study of matter and energy at all scales
• It is the fundamental science
all other sciences and technologies rely on the principles of physics.
Astronomy = Physics of the cosmos = Astrophysics
Basic Structure of the Universe
All figured out with quantitative predictions
The earth is a sphere
Structure of the solar system
Populations of other stars
Size of our galaxy
Populations of galaxies
Relative motions of galaxies
Earth is a Sphere
Curvature of the Earth
Diameter of the Earth
• Greeks 200 B.C.• Alexandria to Syene:
800km• Measured 7 degrees• circumference(360°):
42,000 km
• Actual Diameter• 40,000 km
• Google it!• close!!!
Little Things Go Around Big
Things
Galileo proved that not everything orbits the Earth.
Jupiter and its moons actually look like a miniature solar system
Newton & Gravity
Figured out that gravity is the reason planets go around the sun and why moons go around their planets!
Newton & Light
Emitting Sources
Hydro
gen 6
60 n
m
Helium
580 n
m
HR diagram
Measuring the properties of different stars, most stars have a relationship between the brightness and their color.
Color
Bri
ghtn
ess
Same Techniques on Whole Galaxies
• Hubble Tuning Fork
Other Galaxies
Hydro
gen
Helium
Red Shift and the Big Bang
All Galaxies Are Moving Away From Us
Red
Green
Sun
Big Bang
What happens if you rewind time???
Assessment Inquiry
I want to evaluate how well I am teaching
Take the rest of the class period
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