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Define Big Bang Theory.
Theory that states the idea that the universe began as a huge explosion about 14 billion years ago.
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How long ago do scientists think the big bang occurred?
About 14 billion years ago.
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List the 4 pieces of evidence that support the Big Bang Theory.
- 1. Measuring Red Shift
- 2. Abundance of Elements
- 3.Cosmic Background Radiation
- 4. Ripples in Space
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Explain what Red Shift shows.
The universe is expanding, after being closer together.
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Explain what Cosmic Background Radiation shows.
Leftover energy from an explosion.
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Explain what Ripples in Space shows.
Formation of the galaxies as the gravitational pull of mass increases.
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Explain what the Abundance of Elements explains.
The ratio of elements in the Universe is similar to that of a star’s core, as if all of the Universe was once compressed.
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List the 3 types of galaxies.
- 1. Spiral
- 2. Elliptical
- 3. Irregular
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Describe a Spiral galaxy.
Swirl, Twist, Circle, Rotating
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Describe an Elliptical galaxy.
Egg, Oval, Compressed
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Describe an Irregular galaxy.
Different, Shape-less, Random
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What type of galaxy is the Milky Way?
Spiral
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What is the total span (width) of the Milky Way galaxy?
100,000 Ly
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How wide is the Milky Way galactic core?
15,000 Ly
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How far is our solar system from the center of the Milky Way?
30,000 Ly
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How many stars are there in the Milky Way?
About 200 billion stars
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What is radiation?
Energy
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