In a scale model solar system that used a grapefruit to represent the Sun, how far away would the Ea

1
In a scale model solar system that used a
grapefruit to represent the Sun, how far away
would the Earth be?

• 6 inches
• 1 foot
• 5 feet
• 40 feet
• 1 mile

2
In a scale model solar system that used a
grapefruit to represent the Sun, how far away
would the Earth be?

• 6 inches
• 1 foot
• 5 feet
• 40 feet
• 1 mile

3
In a scale model solar system that used a
grapefruit to represent the Sun, how far away
would the nearest star be?

• 100 feet
• 1000 feet
• 1 mile
• 100 miles
• 1500 miles

4
In a scale model solar system that used a
grapefruit to represent the Sun, how far away
would the nearest star be?

• 100 feet
• 1000 feet
• 1 mile
• 100 miles
• 1500 miles

5
Would you expect to be able to take a photograph
of a planet orbiting around another star?

• Yes. Id use a large telescope because the planet
  would be faint.
• No, because the brightness of the star would
  overwhelm the planet.
• Id try with a telescope in space, so that the
  scattered light from the star would be minimized.
• (In a few cases 3 usually 2)

6
Would you expect to be able to take a photograph
of a planet orbiting around another star?

• Yes. Id use a large telescope because the planet
  would be faint.
• No, because the brightness of the star would
  overwhelm the planet.
• Id try with a telescope in space, so that the
  scattered light from the star would be minimized.

7
In order to maximize your chance of seeing a
faint, cooler planet next to a brighter, hotter
star, you should observe

• In visible light
• In ultraviolet light
• In infrared light
• None of the above

8
In order to maximize your chance of seeing a
faint, cooler planet next to a brighter, hotter
star, you should observe

• In visible light
• In ultraviolet light
• In infrared light
• None of the above

9
To detect an extrasolar planet by means of the
Doppler shift, you look for a periodic shift of
the spectrum lines

• Of the star the planet is orbiting
• Of the planet
• Of the star and the planet

10
To detect an extrasolar planet by means of the
Doppler shift, you look for a periodic shift of
the spectrum lines

• Of the star the planet is orbiting
• Of the planet
• Of the star and the planet

11
The orbital period of an unseen planet

• Will be the same as period of the stars Doppler
  shift
• Will be much larger than the stars
• Will be much smaller than the stars

12
The orbital period of an unseen planet

• Will be the same as period of the stars Doppler
  shift
• Will be much larger than the stars
• Will be much smaller than the stars
• Motion gets more complex if there are multiple
  planets.

13
The shorter the period of the Doppler curve

• The closer the unseen planet is to the star
• The farther the unseen planet is from the star
• The greater the mass of the planet
• The smaller the mass of the planet
• 1 and 3

14
The shorter the period of the Doppler curve

• The closer the unseen planet is to the star
• The farther the unseen planet is from the star
• The greater the mass of the planet
• The smaller the mass of the planet
• 1 and 3

15
The larger the mass of the unseen planet

• The larger the Doppler shift of the star
• The smaller the Doppler shift of the star
• The faster the period of the stars Doppler shift
• The slower the period of the stars shift
• 1 and 3

16
The larger the mass of the unseen planet

• The larger the Doppler shift of the star
• The smaller the Doppler shift of the star
• The faster the period of the stars Doppler shift
• The slower the period of the stars shift
• 1 and 3

17
Suppose you found a star similar to the Sun
moving back and forth with a period of 2 years.
What could you conclude?

• It has a planet orbiting at less than 1 AU.
• It has a planet orbiting at greater than 1 AU.
• It has a planet orbiting at exactly 1 AU.
• It has a planet, but we dont know its mass so we
  cant know its orbital distance for sure.

18
Suppose you found a star similar to the Sun
moving back and forth with a period of 2 years.
What could you conclude?

• It has a planet orbiting at less than 1 AU.
• It has a planet orbiting at greater than 1 AU.
• It has a planet orbiting at exactly 1 AU.
• It has a planet, but we dont know its mass so we
  cant know its orbital distance for sure.

19
Jupiter is about 1/10 the diameter of the sun. If
it transited (passed in front) how much would the
suns light dim?

• About 10 (It would be 90 of its regular
  brightness.)
• About 1 (It would be about 99 its regular
  brightness.)
• It would be about half as bright
• None of the above

20
Jupiter is about 1/10 the diameter of the sun. If
it transited (passed in front) how much would the
suns light dim?

• About 10 (It would be 90 of its regular
  brightness.)
• About 1 (It would be about 99 its regular
  brightness.)
• It would be about half as bright
• None of the above

21
Most known extrasolar planets have larger masses
than Jupiter. This means

• Our solar system is special in having many
  terrestrial planets, including earth.
• Our techniques can only find large planets. The
  smaller ones are there we just cant see them.
• We wont know how many smaller planets are out
  there until our searches become more sensitive.

22
Most known extrasolar planets have larger masses
than Jupiter. This means

• Our solar system is special in having many
  terrestrial planets, including earth.
• Our techniques can only find large planets. The
  smaller ones are there we just cant see them.
• We wont know how many smaller planets are out
  there until our searches become more sensitive.

23
Most known extrasolar planets have periods of
less than a few years, but are more massive than
Jupiter. This means

• Our solar system is unusual with Jupiter taking
  12 yrs to orbit.
• Weve only been looking for about a decade. We
  may still discover longer-period extrasolar
  planets.
• Astronomers were surprised that planets as
  massive as Jupiter could be so close to their
  stars.
• All of the above
• 2 and 3

24
Most known extrasolar planets have periods of
less than a few years, but are more massive than
Jupiter. This means

• Our solar system is unusual with Jupiter taking
  12 yrs to orbit.
• Weve only been looking for about a decade. We
  may still discover longer-period extrasolar
  planets.
• Astronomers were surprised that planets as
  massive as Jupiter could be so close to their
  stars.
• All of the above
• 2 and 3

25
Our previous theory of solar system formation
predicted that large planets would form far from
the sun. How can we explain the extrasolar Hot
Jupiters close to their stars?

• Maybe our theory is wrong or incomplete.
• Maybe planets orbits can change after formation,
  due to gravitational encounters with other
  planets or planetesimals.
• Computer models of planet-forming disks suggest
  that waves of material can pull on planets and
  alter orbits.
• All of the above
• None of the above

26
Our previous theory of solar system formation
predicted that large planets would form far from
the sun. How can we explain the extrasolar Hot
Jupiters close to their stars?

• Maybe our theory is wrong or incomplete.
• Maybe planets orbits can change after formation,
  due to gravitational encounters with other
  planets or planetesimals.
• Computer models of planet-forming disks suggest
  that waves of material can pull on planets and
  alter orbits.
• All are possible. We arent sure which is right!
• None of the above

27
Space missions scheduled to launch within a few
years

• Will search for earth-sized planets transiting
  stars.
• Will search for wobbles in stars caused by
  planets much less massive than Jupiter
• Will be sensitive in the infrared and attempt to
  take direct images of extrasolar planets
• All of the above

28
Space missions scheduled to launch within a few
years

• Will search for earth-sized planets transiting
  stars.
• Will search for wobbles in stars caused by
  planets much less massive than Jupiter
• Will be sensitive in the infrared and attempt to
  take direct images of extrasolar planets
• All of the above