1. Prove that the following wff is valid by means of resolution: xp(x)v xq(x) x p(x)vq(x) Why can’t you do this problem?
2. You cannot do these problems because you do not know the math between what you now know and what you would need to know to do the problem!
3. You will have the same problem with understanding the process that scientists call the big bang. Just because you cannot understand some of what scientists say about the big bang does not mean that scientists do not understand it clearly! They know the science between what you know and what is needed to be known to understand the big bang!
17. Red shift is is a form of the Doppler Effect. Sound shows Doppler effect too! Clip on this picture to experience the Doppler effect.
18. red shift What you just heard was the Doppler effect with sound. Red shift is the Doppler effect with light.
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20. Notice that the line groupings are the same – only shifted red .
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22. From our position in the universe, it looks like we are the center because everything appears to be moving away from us. But we are not in the center.
23. As a balloon gets larger every point moves away from every other point.
24. If your galaxy was a raisin, notice that every raisin is moving away from every other raisin. In fact, a raisin far away from you is moving away faster than those that are closer. Our expanding universe acts the same way.
26. This is energy “left over” from the Big Bang. -discovered in the early 1960’s.
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28. This is like an oven that was used to make cookies. The cookies are not visible but the smell is there (evidence) and when you open the oven door there is just a little bit of heat still there (another piece of evidence).
29. What are the two pieces of evidence that support eh Big Bang Theory that we discussed? Video clip of the big bang
Editor's Notes
The purpose of this slide is to help students realize that sometimes we are asked to “learn” that is very hard to understand. Often we do not have the knowledge necessary to make it all “make sense.” That doesn’t mean that a scientist would have a hard time with it!
Astrophysicists are struggling with this right now.
This is the really really hard part to understand.
Of course you would not expect students to memorize “cosmic particle horizon” but it is such a cool term. Everything outside the horizon cannot be perceived by us.
Click on the picture and have your sound on to here the Doppler effect!
If you are connected to the server, click on the hyperlink for an explanation of red and blue shift.
