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Cards In This Set
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What is the primary topic of the theory of relativity?
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It is a theory of gravity - the force of gravity comes from distortions of space time.
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What is spacetime?
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4 dimensional combination of space and time that forms the 'fabric' of our universe.
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What are the 3 possible geometries of spacetime?
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Flat; spherical; saddle-shaped
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What is a Doppler Shift?
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A shift in wavelength caused by motion towards or away from us.
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What do we learn from redshift & blueshift?
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Red shift = away from us; Blue shift = towards us
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How does a stars rotation affect its spectral lines?
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Faster rotation = broader spectral lines
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The expansion of universe stretches ______ _______.
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Light wavelengths
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How do we measure the age of a star cluster?
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By looking at its main sequecence turn-off point.
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What happens when a star can no longer fuse hydrogen and helium into it's core?
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The core shrinks and heats up.
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What happens if a star's helium core starts to shrink?
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Hydrogen fuses in a shell around the core.
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What are the life stages of a low mass star?
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1. fuses hydrogen in it's core
2. becomes red giant with hydrogen shell & helium insides
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How does a low mass star die?
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It sheds it's outer layers and leaves a white dwarf.
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A high mass star lives a (longer/shorter) life than a low mass star.
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Shorter
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What are the life stages of a high mass star?
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1. fuses hydrogen into helium
2. becomes a hydrogen shell
3. burns heavier elements; becomes supergiant
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How do high mass stars make the elements necissary for life?
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During it's final stages, the core becomes hot enough to fuse carbon & other elements.
This produces a wide range of elements; including all those needed for life.
They are released into space when the star dies.
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