Origins of the Universe Develop: Define red shift Secure: Describe the two different theories of the origins of the universe Exceeding: Explain why the Big Bang theory is the accepted theory by scientists Entrance Activity Write down the differences between meteoroids, meteors and meteorites Tool Box – Key Words https://www.youtube.com/watch?v=CMSYv_Z4SI8 Red shift wavelength Steady state theory Big bang theory Cosmic radiation

How do you think the universe began? Discussion Activity

Light waves Teacher Explanation Before we can explain the origins of the universe we must first understand how the wavelength light is seen. White visible light is split up into a spectrum of colours. You will have seen this in a rainbow. Red is at one end and blue is at the other.

Light waves As you can see the longest wavelength is seen in the red Teacher Explanation Light waves As you can see the longest wavelength is seen in the red When scientists observe objects having a longer wavelength than they should (they are further away) they say they have redshifted. If they observe objects with a shorter wavelength than they should be (they are closer) they say they have blue shifted.

Key Word Alert! Red shift The reddening of light sent out by an object that is moving away from an observer. Red-shift is measured using telescopes such as Hubble telescope

Learning activity Red Shift! Try this worksheet. You have 8 minutes. Then we will swap and go through the answers.

Origins of the Universe Develop: Define red shift Secure: Describe the two different theories of the origins of the universe Exceeding: Explain why the Big Bang theory is the accepted theory by scientists Entrance Activity Write down the differences between meteoroids, meteors and meteorites Tool Box – Key Words Red shift wavelength Steady state theory Big bang theory Cosmic radiation

The Universe Reading Activity

Big bang Teacher Explanation By the red-shift of galaxies and other distant objects, we know that more distant objects are moving away from us faster than closer ones. This can be explained if the universe is expanding. Astronomers use this information and other data to work out the theories that explain the origin and present state of the universe. One of these is know as the big bang theory, first suggested in the 1920s. This says that the whole universe and all the matter in it started out as a tiny point of concentrated energy about 13.5 billion years ago. The universe expanded from this point and is still expanding. As the universe expanded, gravity caused matter to clump together to form stars.

Steady state Teacher Explanation

Origins of the Universe Develop: Define red shift Secure: Describe the two different theories of the origins of the universe Exceeding: Explain why the Big Bang theory is the accepted theory by scientists Entrance Activity Write down the differences between meteoroids, meteors and meteorites Tool Box – Key Words Red shift wavelength Steady state theory Big bang theory Cosmic radiation

Video Theories! Watch the following video about the origins of the universe. Make notes as you watch the video. https://www.youtube.com/watch?v=1sFQCf95CDg

Cosmic microwave background radiation Teacher Explanation Cosmic microwave background radiation

Summary Learning activity Try this worksheet. https://www.youtube.com/watch?v=HdPzOWlLrbE Try this worksheet.

Origins of the Universe Develop: Define red shift Secure: Describe the two different theories of the origins of the universe Exceeding: Explain why the Big Bang theory is the accepted theory by scientists Entrance Activity Write down the differences between meteoroids, meteors and meteorites Tool Box – Key Words Red shift wavelength Steady state theory Big bang theory Cosmic radiation