1. MLSC 550: Modern Astronomy
Christopher M. Johns-Krull
Nov. 10, 2016

2. Have Found Some MACHOS

3. Expansion of the Universe

4. Galaxies Cluster on Large Scales

5. Expansion: Is There a Center?

6. Is There a Center?

7. Look Back Time & Distance

8. Look Back Time, Distance, and Observable Universe

9. Cosmological Redshift

10. Redshift then Implies Lookback Time or Distance

11. Redshift then Implies Lookback Time or Distance
λobs/λem = 1 + z

12. Redshift and High Velocity
When v = 0.9 c, z = 3.36
= z

13. Redshift Gives Size Change
λobs/λem = 1 + z

14. Redshift Related to Lookback Time
λobs/λem = 1 + z

15. Galaxies Cluster on Large Scales

16. Cosmological Principle

17. Cosmological Principle

18. Running Time Backwards

19. Evidence for a Hot Big Bang

20. Olber’s Paradox

21. Olber’s Paradox

22. Einstein’s Greatest Blunder

23. Cosmic Microwave Background
1965
First predicted in 1940

24. Big Bang Nucleosynthesis
But there is too much He!

25. Big Bang Nucleosynthesis

26. Cosmic Microwave Background

27. Get’s Better and Better

28. Get’s Better and Better

29. Why 2.7 K?

30. Why 2.7 K?

31. Running Time Backwards

32. Radiation Density & Mass Density

33. Evolution of Radiation Temperature

34. Shape of the Universe & Density

35. CMB & Shape of the Universe

36. Formation of Structure

40. CMB & Shape of the Universe

43. Accelerating Universe?

44. Accelerating Universe

45. Accelerating Universe

46. Evolution of Density

47. Density Nomenclature

48. Summing Up the Universe

49. Composition of the Universe

50. Precision Cosmology

51. Running Time Backwards

52. Pair Creation

53. Unified Theories

55. The Afterglow From 380,000 yrs

56. Inflation Why is the Universe Uniform?
Where did the seeds of structure come from?
Why does the Universe appear flat today?

60. Precision Cosmology

61. Composition of the Universe

62. Blunder or Prediction?