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Cosmology How did our universe form?. The study of the universe – its nature, origin and its evolution.

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Presentation on theme: "Cosmology How did our universe form?. The study of the universe – its nature, origin and its evolution."— Presentation transcript:

1 Cosmology How did our universe form?

2 The study of the universe – its nature, origin and its evolution

3 Big Bang Theory Theory that the universe began as a point and has been expanding ever since About 13.7 billion years ago EXPANSION rather than an explosion

4 Steady State Theory Universe looks the same on large scales to all observers Matter is added to created and added as universe expands Density remains the same

5 Possible Outcomes* Open Universe – Expansion will never stop Closed Universe – Expansion stops and turns into contraction Flat Universe – Expansion slows to a halt * Based on Big Bang Model

6 Background Noise Cosmic background radiation: –Weak radiation left over from the early hot stages of the Big Bang expansion of the universe Discovered in 1965 in a lab in Holmdel, New Jersey

7 Background Noise Continued… Average temperature of CBR is K (-270°C) Earths atmosphere blocks most of the radiation. Best seen by satellites or high altitude balloons

8 COBE Cosmic Background Explorer –Orbiting observatory used to map radiation in detail (1989) WMAP: Wilkinson Microwave Anisotropy Probe (2001)

9 On your own… Questions 4-8


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