E.S. Space unit I: The Universe & its Galaxies
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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.
How long ago do scientists think the big bang occurred?
About 14 billion years ago.
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
Explain what Red Shift shows.
The universe is expanding, after being closer together.
Explain what Cosmic Background Radiation shows.
Leftover energy from an explosion.
Explain what Ripples in Space shows.
Formation of the galaxies as the gravitational pull of mass increases.
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.
List the 3 types of galaxies.
- 1. Spiral
- 2. Elliptical
- 3. Irregular
Describe a Spiral galaxy.
Swirl, Twist, Circle, Rotating
Describe an Elliptical galaxy.
Egg, Oval, Compressed
Describe an Irregular galaxy.
Different, Shape-less, Random
What type of galaxy is the Milky Way?
What is the total span (width) of the Milky Way galaxy?
How wide is the Milky Way galactic core?
How far is our solar system from the center of the Milky Way?
How many stars are there in the Milky Way?
About 200 billion stars
What is radiation?
What would you like to do?
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