Big Bang Theory

​Big Bang Theory/Universe Expansion Notes

Let's Review NB 10 & 11

In the raisin bread and balloon galaxy models, the raisins or galaxies stayed the same size, but moved further apart as the dough or balloon expanded.

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Models - part 1

Multiple Choice

Based on the models, is the Universe expanding, contracting or staying the same?

• expanding

• contraction

• staying the same

Multiple Choice

Which is an advantage of using models to study the Big Bang Theory?

• Models give us perspective or an idea as to how something works that we can’t otherwise see.

• Models are always completely accurate and to scale.

• Models allow us to create our own laws of science.

Hubble noticed Ultra Far away stars were moving away- could

tell from the red shift.

Video #1

​Galaxies are moving away now, so they must have started from one point.

​​Video #2

​CBR & CMBR are visible with radio telescopes

​​Video #3

Red Shift of light implies a starting point.

Radiation is dectected.

We have an abundance of light elements in the universe - H and He​

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​​Video #4

​Big Bang Theory & its Evidence - NB 11

​Edwin Hubble suggests that the universe started with an explosion creating space & time

​"Big Bang" was named as a joke at first.

​Just after the start of universe, it was super hot - too hot for protons to form.

​Light called Cosmic Background Radiation has been travelling for 13.7

billion years.

Cosmic radiation from the Big Bang is spread throughout the universe as an "afterglow" of the explosion.

Theories help provide the most logical explanation to a question or problem or phenomena. Theories are needed to help understand laws. Laws describe or predict a range of natural phenomena.

​scientific theory or Law?

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Multiple Choice

Which term best describes conditions a few seconds after the Big Bang took place?

• frigid/freezing cold

• liquid

• scorching hot

• placid/calm