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Identify the units of a calendar. How do scientists study space?

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Presentation on theme: "Identify the units of a calendar. How do scientists study space?"— Presentation transcript:

1 Identify the units of a calendar. How do scientists study space?

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

3 Astronomy History

4 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 – 365.25 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 Elliptical Orbit Video

13 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 Galileo Telescope Video

14 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

15 Astronomy History Edwin Hubble 1924 Proved other galaxies existed beyond our galaxy The universe is much MUCH bigger than previously thought General Relativity Video

16 Astronomy: A history

17 Identify the units of a calendar. How can you study space?

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