# It Is Elementary My Good Students, The Universe Has No Center!

In this lesson, we will explore the concept of whether or not there is a "center" to the Universe.

Consider the following statements:

• The Universe began with an explosion.

• If the Universe began with an explosion, then the Universe must be expanding.

• If the Universe is expanding, it has no center.

1. Using the Law of Syllogism, re-write all of the conditional statements so that the reasoning makes sense and is valid.
2. ___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

3. Let us now use a Direct Proof. Translate the argument below into symbolic form, then prove that the argument is valid.
4. Let E: The Universe began with an explosion.
Let A: The Universe is expanding.
Let C: The Universe has no center.

5. If the Universe began in an explosion and is expanding, is it or is it not required to have a center? Explain.
6. ___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

7. Remember that the term center is defined as a point of origination. In other words, all of the objects in the Universe would be moving away from that one particular point. Do you think such a point exists?

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

### Let's Investigate!

1. ) Let us start with a one-dimensional view . Use the elastic bands with sequins from the Expanding Universe lesson. Pick a galaxy to be the "center". Stretch the band a little and measure how far all other galaxies are from it. Then stretch and measure again. What do you see? Pick another galaxy to be the center. Perform the experiment over. What happens this time? Given one more galaxy the honor of being the "center of the Universe" and repeat.

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

2.) Two Dimensions — now do the above procedure on a 2 dimensional surface like a balloon or a beach ball. Between your sets of measurements, blow up the balloon/ball a little more than it was.

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

3.) Our Universe — so what does all of this have to do with our perception of the Universe? Earth appears to be the center of the expansion of the Universe. After all, galaxies are moving away from us in all directions. However, this is an illusion. If we were in one of those other galaxies, we would think that there we were the center of the expansion. There really is no center, just like on the elastic band or the balloon surface, everything is moving away from everything else. Your teacher will now show you a visualization of this.

When you look at each image, is there an obvious "center" to the distribution?

________________________________________________________________________

________________________________________________________________________

Once the sheets are overlaid, does a pattern emerge? Describe it.

________________________________________________________________________

________________________________________________________________________

As the top sheet is shifted slightly up or to the right, what happens to the distribution? Describe what happens.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

How does this demonstration relate to what you have learned about the Universe?

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

Describe what you would do so that ANY dot could appear to be the center of the expansion.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

This site currently under construction to become 508 compliant.