The Big Bang Theory

Big Bang theory

Open Ended

What do you know about the Big Bang theory?

The origins of the universe 

• This theory suggests that the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today

• Scientists believe that the solar system formed about 4,500 million years ago in a huge cloud of gas and dust called a nebula.

Evidence 

- Mathematical formulas and models has formed much of our understanding of the Big Bang Theory so far. However evidence exists to support this theory. 

- One form of evidence is that Scientists believe we can see the "echo" of the expansion through a phenomenon known as the cosmic microwave background.

Evidence 1 - COSMIC MICROWAVE BACKGROUND 

Poll

If you were to point a satellite dish at into any point in space, what would you expect to hear?

• Nothing

• Quiet noises like the wind blowing

• indistinguishable noise

• Static

If you were to point a satellite dish into empty space you would get static  

The universe has an underlying static - Cosmic microwave background  

Before the Bang

• Scientists believe that before the Big Bang space and time didn't exist and all that existed was energy

• The Big Bang occurred when all of this energy was concentrated into a single point called 'singlularity'

• Space began to expand quickly and the temperature was hot (an estimated 100 million trillion trillion degrees!)

Cosmic Microwave Background 

• Big Bang Theory suggests that the universe was a very hot place and that as it expands, the gas within it cools 

• As the universe began to cool, radiation began to fill the universe as a remnant of the heat left over - this is called 'Cosmic Microwave Background'

• The cosmic microwave radiation is like an 'afterglow' of radiation

Fill in the Blank

According to the big bang theory ,what was there at

the time of the big bang?