Topic 7 – Astronomy1

Question 1

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

Answer 1

• Their differences in their mass

Question 2

M V E M J S U N

Answer 2

• My
• Very
• Educated
• Mother
• Just
• Served
• Us
• Noodles

Question 3

Geocentric

Answer 3

• Everything orbits Earth

Question 4

Heliocentric

Answer 4

• Everything orbits the Sun

Question 5

What does our solar system consist of?

Answer 5

• Sun
• Planets
• Natural satellites
• Dwarf Planets
• Asteroids
• Comets

Question 6

Orbit of Moon

Answer 6

• Circular around planets

Question 7

Orbit of Planets

Answer 7

• Slightly elliptical around sun

Question 8

Orbit of Comets

Answer 8

• Very elliptical around sun

Question 9

Orbit of Artificial Satellites

Answer 9

• Circular around any body

Question 10

Explain speeds of circular orbits

Answer 10

• Remain unchanged, but velocity is changing, so acceleration is increasing

Question 11

Relationship between orbit speed and radius

Answer 11

• Higher orbit speed requires smaller radius

Question 12

Big Bang:

Answer 12

• Everything started at one point, and keeps expanding

Question 13

Steady State Theory:

Answer 13

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

Question 14

Red shift:

Answer 14

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

Question 16

Evidence of Big Bang and Steady State Theory

Answer 16

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

Question 17

Evidence of Steady State Theory

Answer 17

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

Question 18

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

Answer 18

• Frequency and wavelength

Question 19

What dis