solar system,orbits + red shift,big bang

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  • Created by: rxbyw
  • Created on: 26-01-19 18:06
what is a natural satellite + an example?
a naturally occurring object which orbits a planet with smaller mass than the planet eg the moon
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what keeps the object in orbit around the sun?
gravity
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how is the light observed from a distant galaxy different from the light that the galaxy actually emits?
the observed wavelength is greater than the wavelength of the light when it is emitted.
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state an observation that contradicts the steady state theory
the light observed from distant galaxies is red shifted and it is more red shifted the further the galaxy is away from us. suggests universe is expanding and hasnt remained the same size forever.
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state the big bang theory
the universe began as a small region of space that was very hot and very dense. it exploded and has been expanding ever since.
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what have observations of supernovae since 1998 show scientists about the expansion of the universe?
they show that distant galaxies are receding faster so the universe is expanding at an accelerated rate
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name one feature of the universe which is unexplained
dark matter
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explain why galaxies are not pulled apart by the expansion of the universe
they are held together with gravity
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what is red shift
the lights wavelength which has increased towards the red end of the spectrum
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state how you would expect a galaxy's red shift to change in the future compared to its current red shift?
it will have increased as the universe is expanding so the galaxy is further away and will be travelling faster away so a greater red shift would be observed.
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the further away a galaxy is...
the faster it is travelling away and the greater its red shift
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Other cards in this set

Card 2

Front

what keeps the object in orbit around the sun?

Back

gravity

Card 3

Front

how is the light observed from a distant galaxy different from the light that the galaxy actually emits?

Back

Preview of the front of card 3

Card 4

Front

state an observation that contradicts the steady state theory

Back

Preview of the front of card 4

Card 5

Front

state the big bang theory

Back

Preview of the front of card 5
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