Topic 7 – Astronomy1 Flashcards

1
Q

Why do the values of gravity on earth and the moon differ?

A
  • Their differences in their mass
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2
Q

M V E M J S U N

A
  • My
  • Very
  • Educated
  • Mother
  • Just
  • Served
  • Us
  • Noodles
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3
Q

Geocentric

A
  • Everything orbits Earth
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4
Q

Heliocentric

A
  • Everything orbits the Sun
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5
Q

What does our solar system consist of?

A
  • Sun
  • Planets
  • Natural satellites
  • Dwarf Planets
  • Asteroids
  • Comets
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6
Q

Orbit of Moon

A
  • Circular around planets
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7
Q

Orbit of Planets

A
  • Slightly elliptical around sun
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8
Q

Orbit of Comets

A
  • Very elliptical around sun
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9
Q

Orbit of Artificial Satellites

A
  • Circular around any body
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10
Q

Explain speeds of circular orbits

A
  • Remain unchanged, but velocity is changing, so acceleration is increasing
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11
Q

Relationship between orbit speed and radius

A
  • Higher orbit speed requires smaller radius
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12
Q

Big Bang:

A
  • Everything started at one point, and keeps expanding
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13
Q

Steady State Theory:

A
  • As galaxies move apart, new ones will be formed in the gaps
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14
Q

Red shift:

A
  • When light waves are stretched, causing wavelengths to appear longer, shifting towards red side of spectrum
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15
Q
A
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16
Q

Evidence of Big Bang and Steady State Theory

A

Red shift:
- When light waves are stretched due to Galaxies moving away from each other, meaning they all came from one point

17
Q

Evidence of Steady State Theory

A

Red shift:
- When light waves are stretched due to Galaxies moving away from each other, meaning they all came from one point

18
Q

if a wave source is moving relative to an observer, what variable would change?

A
  • Frequency and wavelength
19
Q

What dis

A