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Ch. 4 Sec. 5 The Expanding Universe Warmup 19/11 1.What happens to the distances between galaxies that are close together? 2.What happens to the distances.

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Presentation on theme: "Ch. 4 Sec. 5 The Expanding Universe Warmup 19/11 1.What happens to the distances between galaxies that are close together? 2.What happens to the distances."— Presentation transcript:

1

2 Ch. 4 Sec. 5 The Expanding Universe

3 Warmup 19/11 1.What happens to the distances between galaxies that are close together? 2.What happens to the distances between galaxies that are far apart? 3.If the universe is expanding, do galaxies that are close together move apart faster or slower than galaxies that are far apart? Explain.

4 Big Bang Theory theory that universe formed in an instant, billions of yrs. ago, __________________

5 Video clip-The Big Bang

6 Edwin Hubble discovered : 1.galaxies are moving ___________________ 2.relationship between ________________& its speed

7 Hubble’s law _____________ galaxy is  faster it is moving away from us

8 Video clip- Moving Galaxies

9 The galaxies in the universe are like the raisins in rising bread dough. How does rising raisin bread dough resemble the expanding universe?

10 cosmic background radiation faint radiation glow that comes from all directions in space leftover thermal radiation _______________

11 How old is the universe? _____ billion years old

12 Video clip-Cosmic background radiation

13 Formation of the solar system

14 1. 5 billion yrs. ago, _____________(gian t cloud of gas & dust) collapsed to form our solar system

15 2. _______ pulled solar nebula together

16 3. Solar nebula __________________ _very fast

17 4. Solar nebula flattened- formed a __________

18 5. Gravity pulled gas into center  ________ _________ began  sun born

19 6. Remaining gas & dust formed ____________- formed planets

20

21 dark matter matter that _________ ______ electromagnetic __________ 23% of universe’s mass

22 dark matter cannot be seen directly- presence can be inferred by effects of its gravity on visible objects

23

24 Video clip-Dark Matter

25 dark energy

26

27 What was the big bang?

28 When did the big bang occur?

29 Describe two pieces of evidence that support the big bang theory?

30 How old is the solar system?

31 What force caused the solar system to form?

32 Place the following events in the proper order: planets form planetesimals form solar nebula shrinks nuclear fusion begins in the sun

33 What is dark matter?

34 How do scientists know that dark matter exists?

35 What evidence has led scientists to predict that the universe will continue to expand forever?

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