Embed Size (px)
Citation preview
• TODAY’S AGENDA:
• Notes: Introduction to the Big Bang Theory
MONDAY 12/2/2013
Homework: 1.
Introduction to the Big Bang Theory
The Origin of the Universe
Edwin Hubble(1889-1953)
Astronomer who made several discoveries that provided clues for how our universe began:
1. Galaxies are “building blocks” of the universe.– What’s the universe?
• Universe: All existing matter, energy & space2. The Milky Way (Earth’s galaxy) was 1 galaxy among billions of others.
– What’s a galaxy?• Galaxy: Is made up of a cluster of stars (solar systems).
There are billions of galaxies within the universe.
3. The galaxies are spreading apart from each other. – How did he figure that out?
• Think about the Rubberband Lab…
– A scientific theory that states that the universe was created from a high density of matter (called a “singularity”) that expanded at very hot temperatures, shooting matter & energy everywhere. Eventually, the matter began to cool off & formed various galaxies.
The Big Bang Theory
Formation of the UniverseOne Scientific Theory –
All matter & energy in the universe was concentrated in an EXTREMELY small volume
13-17 billion years ago, the BIG BANG occurred, propelling matter & energy in all directions universe expanded
Gravity condensed (clumped) matter galaxies
Still many questions remain about the beginning of the universe
“The Big Bang”
But how did Hubble conclude these things (right or wrong) about
our universe?
• What did Hubble (& many other astronomers & scientists) study?
–STARS & the energy they give off!
The Heartbeat of a Star
• What are stars made of?
• What process is the “heartbeat” of a star?– When this process begins, a
star is born, & when this process stops, a star dies…
Nuclear FusionA star is born when fusion begins in the star’s core (center)
H + H à He Fusion is a reaction that combines 2 small nuclei (H) to form larger nuclei (He) The result is the release of a large amount of energy
What are the 2 products (outcomes) of nuclear fusion?
Larger nuclei (atom)
LOTS of energy!
• So what’s the difference between…– Comets:
• Chunks of frozen ice, gases & rocky debris traveling outside the Earth’s atmosphere
– Asteroids: • Bodies of rock.
– The large collection of asteroids in our solar system located between Mars & Jupiter is called the Asteroid Belt
– Meteorites: • Bodies of rock smaller than an asteroid, usually
only meters in size
More Out-of-this-World Terms!
• TODAY’S AGENDA:
• Notes: Evidence of the Big Bang: EM Spectrum
TUESDAY 12/3/2013
Homework: 1. Wavestown Activity due
Wed/Thursday 12/4-12/5/2013 for 25 Points
CERN Article & Video Clip
Read through the short article about CERN (European Organization for Nuclear Research).
DO NOT WRITE ON THE ARTICLE!!!
When you are finished reading, in your next Warm-up box, write 3 words that summarize (sum up) what the article is about.
CERN VIDEO: So how do astronomers know what’s going on inside the core of a star?
http://www.ted.com/talks/brian_cox_on_cern_s_supercollider.html
Evidence for the Big Bang?1920’s – Edwin Hubble
At time of Big Bang, matter was SO dense & hot (billion degrees) that the universe acted like a GIANT nuclear reactor
Hydrogen (H) atoms fused (nuclear fusion) to make light elements (helium (He), lithium (Li) creating billions of stars (in millions of galaxies)
Discovered Andromeda Galaxy: galaxies exist outside our Milky Way
Galaxies are moving apart & away from other galaxies
The Expansion of the Universe• Hubble likened the moving away (expansion) of the galaxies from one
another to cooking raisin bread…– Each raisin represents a galaxy. When the bread is uncooked, the
raisins float in the batter relatively close to one another. When heat is added, the bread itself expands, as well as the raisins within the bread move further apart from each other.
Evidence for the Big Bang Theory
• Light & Electromagnetic Radiation
• Doppler Effect (Doppler Shift)
Evidence for the Big Bang? The Electromagnetic Spectrum
1665: Isaac Newton observed sunlight (white light) passing through a glass prism produced a rainbow of colors = visible light spectrum
Electromagnetic Spectrum Article• Take out 1 piece of blank paper & label it
“Electromagnetic Spectrum Article Summary”– NAME, DATE & PER in the top right!
• Read the following article making sure you keep in mind the key points
• You will be writing a one page summary over the reading! Make sure you put effort into this assignment, these are your notes!
Name Per Date
Electromagnetic Spectrum Article Summary
Main Idea Sentence Pictures
Evidence for the Big Bang? The Electromagnetic Spectrum
Visible Iight travels in the form of electromagnetic (EM) waves
ROYGBIV (red, orange, yellow, green, blue, indigo, violet) & white Visible light is SMALL portion of electromagnetic (EM) spectrum
Radio wavesMicrowavesInfraredUltraviolet raysX-raysGamma rays
Brain Pop: EM Spectrum http://www.brainpop.com/science/ energy/electromagneticspectrum/
The Electromagnetic Spectrum• WAVELENGTH: Distance from the top of one wave to the top of the next
waveEach form of radiation has a different wavelengthWhat does a radiation’s wavelength tell us?
How powerful (how much energy) the radiation isWhat kind of radiation it is
The Electromagnetic SpectrumVisible light:
Red light = looooooooooooooongest, Violet light = shortest
On the entire EM Spectrum, Radio waves: longest wavelength
~500 m (5 102 m) Visible light: middle
~.0000005 m (5 10-7 m)
Gamma rays: shortest wavelength
~.000000000005 m (5 10-12
m)
Wavestown Activity• For this assignment, you will be coloring and
answering the questions on the back side.
• For the front side, once it is colored, you are to identify 5 examples of each energy in the picture. Place the number next to the item to identify which type of energy it radiates
• This is due Wednesday/Thursday 12/4-12/5/2013 for 25 Points!!
• TODAY’S AGENDA:
• Notes: Evidence of the Big Bang: EM Spectrum
• http://app.discoveryeducation.com/search?Ntt=big+bang+theory
WEDNESDAY/THURSDAY 12/4-12/5
Homework: 1. Wavestown Activity due
Wed/Thursday 12/4-12/5/2013 for 25 Points
• TODAY’S AGENDA:
• Notes: Evidence of the Big Bang: EM Spectrum
TUESDAY 12/3/2013
Homework: 1. Wavestown Activity due
Wed/Thursday 12/4-12/5/2013 for 25 Points
Evidence for the Big Bang? Spectroscopy: study of stellar (star) spectra (colors) to find out chemical make-up of stars
Every star has a unique spectra = fingerprint
Heated chemical elements produce a “bright-line” spectrum
Series of thin colored lines spaced at uneven intervalsEach element makes a different spectrum
Evidence for the Big Bang?• Spectroscope: instrument used to separate light into its component
colors– How it works:
1.Light reflects off of surface, like a mirror2.Light diffracts (separates) different colors of light (like a prism)
• Scientists can tell the specific kinds (i.e., nationalities) & percentages (50% German, 30% African, 20% Native American) of each element a star is made from
Atoms make up each chemical element.
When heated, atoms release a specific pattern of light energy (like in the birth of a star)!
No 2 elements are the same!!!
A star’s spectra = a fingerprint!
EM Spectrum REVIEW
1. How does the wavelength of electromagnetic radiation change from gamma radiation to radio waves?
2. Which portion of the electromagnetic spectrum do human eyes detect (see)?
3. The shorter the wavelength the greater the energy of a wave. Which has more energy, x-rays or microwaves?
EM Spectrum Quiz
Write your NAME, PER, DATE on your EM Spectrum Quiz!
Answer the following questions in 1 complete sentence!
When finished, please turn your EM Spectrum Quiz in to the
EM Spectrum Quiz• 1. What does EM stand for?
• 2. List the spectrum of radiatiuon from weakest to strongest
• 3. List the colors of the visible light spectrum from strongest to weakest
• 4. What radiation is the only form we can see with the naked eye?
• 5. Give an example of UV radiation
• 6. What does a long wavelength mean? Short wavelength?
• 7. A wavelength is defined as ________ to _________ on waves
• 8. Give an example of radiowaves
• OK, so we understand that there are many different forms of EM energy (radiation) that stars (& other weird objects in the universe) give off…– But can that energy move?– How can we tell the energy is moving? Closer to us? Further from us?– How do astronomers tell whether a galaxy (& the stars/energy) is moving
toward or away from them (observer) on Earth?– Look at how the wavelengths of energy change!
The Doppler Effect…sound waves
In order to understand the Doppler Effect better, think about standing next to a train track.
What does the train’s horn sound like when it is approaching toward you quickly?
What does the train’s horn sound like when it is moving away from you quickly?http://paws.kettering.edu/~drussell/Demos/doppler/carhorn.wav
Evidence for the Big Bang?
The Doppler EffectOccurs with starlight (visible light & other forms of EM radiation) in galaxies too!!!
Scientists have observed galaxies moving away & apart from each other at high speeds (Rubberband Lab?)
Light moving toward observer wavelengths of light appear shorter = “Blue Shift”
Light moving away from observerwavelengths of light appear longer = “Red Shift”
Evidence for the Big Bang?
The Doppler EffectShift in wavelengths of energy (radiation or sound) moving toward or away from an observer = “Doppler Effect (Doppler Shift)”
The spectra of most galaxies is moving toward the Red end = moving away from us (our galaxy)
Degree of Red Shift = speed at which galaxies are traveling
Now make your Conclusions!
• Taking what you just experienced with the train noise & what we just talked about (Doppler Effect)…let’s reflect back to the…UNIVERSE!– In your conclusion box, explain HOW astronomers study stars to understand
the movement of galaxies (& what is going on in our universe). • You MUST use the terms Doppler Effect & blue- or red-shift in your
answer.• Must be 15-20 sentences long• When finished bring it up for a stamp!
http://paws.kettering.edu/~drussell/Demos/doppler/carhorn.wav
ANNOUNCEMENT: Please take out your notes and take a couple minutes to review!!
Today’s Agenda•Quiz: Energy and the Big Bang
Friday 12/6/2013
