# Astronomy college course/Pluto and planetary mass quiz

## AstroPluto and planetary mass_Study

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### AstroPluto and planetary mass_Study-v1s1

1. Which of the following is NOT used to measure the mass of a planet

___ a) the motion of a neighboring planet
___ b) all of these have been used
___ c) the rotation of the planet about its axis
___ d) the motion of an artificial satellite
___ e) the motion of a moon

2. What is unusual about calculations of the mass of Pluto made in the early part of the 20th century?

___ a) It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
___ b) It was the first time a moon was used to calculate the mass of a planet
___ c) The estimates were too low. Pluto was actually more massive than they thought.
___ d) The estimates were high. Pluto was less massive than they calculated
___ e) The estimates were correct to within less than 10%

3. Why was the discovery of Pluto peculiar?

___ a) It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
___ b) It was seen by Galileo, who thought it was a star
___ c) It was seen by Halley, who was looking for comets
___ d) It was discovered by a calculation based on flawed assumptions
___ e) It was discovered during a survey looking for stars

4. Which of the following is NOT used to measure the mass of a planet

___ a) the motion of a neighboring planet
___ b) the motion of an artificial satellite
___ c) the motion of a moon
___ d) all of these have been used

5. Which statement describes the relation between Pluto and Neptune

___ a) Pluto's orbit intersects Neptune's orbit an the two bodies will eventually collide
___ b) Pluto's orbit intersects Neptune's orbit but they avoid each other because Pluto's mass is too small
___ c) Pluto's orbit intersects Neptune's orbit but they don't collide because of an orbital resonance between the two
___ d) Pluto's orbit lies outside Neptune's orbit

#### Key to AstroPluto and planetary mass_Study-v1s1

1. Which of the following is NOT used to measure the mass of a planet

- a) the motion of a neighboring planet
- b) all of these have been used
+ c) the rotation of the planet about its axis
- d) the motion of an artificial satellite
- e) the motion of a moon

2. What is unusual about calculations of the mass of Pluto made in the early part of the 20th century?

- a) It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
- b) It was the first time a moon was used to calculate the mass of a planet
- c) The estimates were too low. Pluto was actually more massive than they thought.
+ d) The estimates were high. Pluto was less massive than they calculated
- e) The estimates were correct to within less than 10%

3. Why was the discovery of Pluto peculiar?

- a) It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
- b) It was seen by Galileo, who thought it was a star
- c) It was seen by Halley, who was looking for comets
+ d) It was discovered by a calculation based on flawed assumptions
- e) It was discovered during a survey looking for stars

4. Which of the following is NOT used to measure the mass of a planet

- a) the motion of a neighboring planet
- b) the motion of an artificial satellite
- c) the motion of a moon
+ d) all of these have been used

5. Which statement describes the relation between Pluto and Neptune

- a) Pluto's orbit intersects Neptune's orbit an the two bodies will eventually collide
- b) Pluto's orbit intersects Neptune's orbit but they avoid each other because Pluto's mass is too small
+ c) Pluto's orbit intersects Neptune's orbit but they don't collide because of an orbital resonance between the two
- d) Pluto's orbit lies outside Neptune's orbit