WEAKNESSES - Astrophysics

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Last updated 11:06 AM on 6/14/26
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7 Terms

1
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why do planets nearer to a star take less time to orbit? (2)

  • they have a shorter orbit

  • they travel faster

2
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where are the brightest stars on the HR diagram?

top row

<p>top row</p>
3
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where are the dimmest stars on the HR diagram?

bottom row

<p>bottom row</p>
4
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where are the coolest stars on the HR diagram?

right column

<p>right column</p>
5
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where are the hottest stars on the HR diagram?

left column

<p>left column</p>
6
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why is the moon not on the HR diagram? (2)

  • the moon is not a star

  • the moon is not a light source, it reflects light

7
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explain how the red-shift of galaxies supports the Big Bang Theory? (5)

  • greater red shift = faster the galaxy is moving away

  • further galaxy is away = greater red shift

  • therefore further away a galaxy is the faster it is moving away which implies expansion

  • distance and speed are directly proportional

  • at one point there was a single point where all matter existed (singularity)