Presentation on theme: "The Universe"— Presentation transcript:
The Universe http://science.howstuffworks.com/big-bang-theory1.htm
How do we know what happened billions of years ago? Scientific theories are usually formed when someone makes observations and then forms conclusions about what he/she sees.
What’s happening? (observe) The kitchen is messy with spilled flour and sugar, the oven is warm, candles are scattered around the floor.
Form a conclusion Someone is making a birthday cake
Detectives are Scientists They make observations about: –Evidence at the scene –Prints left behind –Motive or reasons –DNA collected
…and form conclusions. They may not have witnessed the crime, but they can make an educated guess about what happened.
Which direction did the blast from Mt. St. Helens, WA come from?
Which way does the wind usually blow on Humphrey Head Island, UK?
You weren’t there, but you can make an educated guess based on your observations. Which direction is the bullet moving? To the left? To the right?
Astronomers (people who study space) are detectives They study and observe the universe and then form conclusions about out how it probably formed.
So how did our universe form? Using telescopes, spectroscopes, and other instruments, scientists have made the following observations….
Observations What is happening to our universe? Years ago Present day
Galaxies are spreading farther and farther apart If we work backwards, then 13.7 billion years ago, all matter use to be all together
How do we know if stars are moving towards Earth or away? The Doppler effect Chime demo Sound waves move differently when they come towards you or move away from you. http://www.youtube.com/watch?v=imoxDcn2Sg ohttp://www.youtube.com/watch?v=imoxDcn2Sg o Doppler effect siren http://www.youtube.com/watch?v=a3RfULw7a AY&feature=relatedhttp://www.youtube.com/watch?v=a3RfULw7a AY&feature=related Doppler effect car horn
Light waves from stars also show a difference when they move. Use a spectroscope Red shift = moving away from you Blue shift = moving towards you
5. The universe will stop expanding and gravity will pull it back into a ball and then the big bang will happen again.
http://teachertube.com/viewVideo.php?video_id=73929&title=Big_Bang History Channel Big Bang 3min http://www.youtube.com/watch?v=OdsWhHWdc1g&feature=player_embedded#%21 The Big Bang demonstrated by a college band How big is the Universe? http://www.youtube.com/watch?v=5NU2t5zlxQQ&feature=player_embedded Big Bang Theme Song http://www.youtube.com/watch?v=lhTSfOZUNLo Neil deGrasse Tyson's Origins: Back To The Beginning (from 2004) which has the EM spectrum, Big Bang, cosmic microwave background radiation, origin of the elements, atomic spectra - a lot of Big Picture kind of stuff with details of Chemistry in there. And is nicely done and has Neil's flair.
Homework Create a five panel strip that shows the five steps (1-5 on your notes) of the formation of our universe. Each panel should be colored in and have a brief sentence about what happened. You may chose either ending to give to panel five.