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33 Cards in this Set
- Front
- Back
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What is the Big Bang Theory?
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a theory that all the matter and energy in the universe must have been compressed into a very small space , then exploded from a singularity point and started expanding
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How old is the universe and how do we know?
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around 14 billion years old, we use the current rate of expansion to estimate this.
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What is the 'Steady State' theory?
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a theory that the universe has always existed as it is now
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What is the Steady State theory based on?
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The idea that that the universe appears pretty much the same everywhere
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What does the Steady State theory explain?
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the apparent expansion by suggesting that matter is being created in the spaces as the universe expands. There are big problems with this theory. |
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What evidence is there to support the Big Bang theory?
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Cosmic Microwave Background Radiation (CMBR) which was produced just after the Big Bang and continues to expand with the universe
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What is Cosmic Microwave Background Radiation (CMBR)?
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A low frequency electromagnetic radiation coming from all parts of the universe, coming from the microwave part of the EM spectrum
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Where did Cosmic Microwave Background Radiation (CMBR) come from?
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Just after the Big Bang, while the universe was still extremely hot, everything inside it emitted very high frequency radiation. |
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What happened to the Cosmic Microwave Background Radiation (CMBR) as the universe expanded?
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the universe cooled and the radiation dropped in frequency - it is now known as Microwave radiation.
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What is a limitation from the Big Bang theory's predictions?
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it predicts that the universe's expansion should be slowing down but as far as we can tell it's speeding up.
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What is a good and two bad factors of the Big Bang?
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-Explanation for the universe's expansion -Explanation for what actually caused the explosion -what the conditions were like before the explosion, if there was abefore |
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What do different chemical elements do?
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absorb different frequencies, each producing a specific pattern of dark lines at the frequencies it absorbs in the visible spectrum
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How do we know the universe is still expanding?
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through Red Shift
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how is redshift shown in the light from distant galaxies?
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the same patterns are shown but from slightly lower frequencies so are shifted to the red end of the visible spectrum are absorbed
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what is the Doppler effect?
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the change in frequency of sound, light or other waves as the source and observer move towards or away from each other
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How do the sound waves change when a car moves away from the observer
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the frequency will seem lower and its wavelength will seem longer
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