1. Objective 03/26/12
Identify the units of a calendar.
Intro
How do scientists study space?

2. Objective 04/26/11
Explain how scientists study space and develop theories based on observations.
Intro
Of the astronomers we learned yesterday, which do you think had the most impact on Astronomy? Why?

3. Astronomy History

4. Astronomy History
Astronomy
The study of the universe

5. Astronomy History Calendar Year
Based on the observation of objects in our solar system
Time required for Earth to orbit once around the sun
days

6. Astronomy History Month Day
Amount of time required for the moon to orbit once around Earth
~ 28 days
Time required for Earth to spin once on its axis
24 hours

7. Astronomy History Rotation (rotate) Revolution (revolve or orbit)
Spin on an axis
Go around an object

8. Astronomy History Early Astronomers
Could only observe the universe with their eyes and minds
Thought universe had only Sun, Moon, and planets, with stars at the edge of universe

9. Astronomy History Ptolemy 140 C.E. Greek Astronomer Geocentric
Earth at center of universe
This theory lasted 1,500 years!

10. American History Copernicus 1543 Polish Astronomer Heliocentric
Sun is the center of the universe

11. Astronomy History Tycho Brahe Late-1500s Danish Astronomer
Invented several large tools to study the universe and took many precise measurements and data
Believed in different geocentric universe

12. Astronomy History Johannes Kepler 1609 Brahe’s assistant
Used Brahe’s data to prove heliocentric universe AND planets orbit in elliptical orbit
Developed the 3 laws of planetary motion which are still used today

14. Astronomy History Galileo Galilei 1609
First person to use a telescope to observe object’s in space
Discovered:
Moon has craters and mountains
Four of Jupiter’s moons
Sunspots on the Sun

16. Astronomy History Isaac Newton 1687 Discovered the law of gravity
All objects in the universe are attracted to each other
Explains the orbits of planets around the Sun

17. Astronomy History Edwin Hubble 1924
Proved other galaxies existed beyond our galaxy
The universe is much MUCH bigger than previously thought

18. Astronomy: A history

20. Objective 03/26/2012
Identify the units of a calendar.
Outro
How can you study space?