Kepler's 3rd law of planetary motion explains:

Why it takes so long for planets like Neptune to make a complete revolution

Which of the following describes Kepler's 1st Law of planetary motion?

Planets travel in ellipses as they orbit the Sun.

In order to calculate an ellipse's eccentricity you would:

Divide the distance between focus points by the diameter.

Which of the following best explains the retrograde motion of planets?

Planets move at different speeds as they orbit the Sun.

Copernicus contributed to the field of astronomy by:

Suggesting that the Sun is at the center of the solar system

Which of the following represents a problem with the geocentric model of the solar system?

Planets changed brightness and appeared to travel backwards.

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Overview of the Solar System

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Simple astronomy quiz.

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Questions 13

Answers

1
Kepler's 3rd law of planetary motion explains:
Why planets speed up in their orbits as they get closer to the Sun.
Why planets travel in elliptical orbits.
Why it takes so long for planets like Neptune to make a complete revolution
All of the above
2
Who proposed this model of the solar system?
Galileo
Kepler
Copernicus
The Greeks
3
Which of the following describes Kepler's 1st Law of planetary motion?
Planets travel in ellipses as they orbit the Sun.
Planets travel faster when they are near the Sun.
The Earth is at the center of our solar system.
The sun is at the center of our solar system.
4
This mathematician proposed three laws of planetary motion:
Galileo
Ptolemy
Copernicus
Kepler
5
On the eccentricity scale, a value of "0" represents what shape?
Ellipse
Circle
Square
Triangle
6
In order to calculate an ellipse's eccentricity you would:
Multiply the distance between focus points by the diameter.
Multiply the diameter by the radius of the ellipse.
Divide the diameter by the distance between focus points.
Divide the distance between focus points by the diameter.
7
Which of the following shows a planet in aphelion?
Position 1
Position 3
Position 2
8
Which of Kepler's laws describes changes to a planet's speed as it orbits the Sun?
1st law
2nd law
All of the above
3rd law
9
Newton's Law of Universal Gravitation says:
Gravitational attraction is influenced by the distance between two objects.
Objects with more mass will exert a greater gravitational attraction.
Both of the above
10
What value best describes the eccentricity for the ellipse shown on the top right of this diagram?
1.0
0.42
0.00
0.78
11
Which of the following best explains the retrograde motion of planets?
Planets actually do move backwards in their orbits
A planet's brightness changes as it orbits the sun
All of the above
Planets move at different speeds as they orbit the Sun.
12
Copernicus contributed to the field of astronomy by:
Suggesting that the Sun is at the center of the solar system
Proposing that planets travel in elliptical orbits.
Suggesting that the Earth is at the center of solar system
Proposing a law of motion for planetary orbits.
13
Which of the following represents a problem with the geocentric model of the solar system?
Planetary brightness changed during the year.
Planets appeared to travel backwards in the sky.
Planets changed brightness and appeared to travel backwards.
Planets moved in circles sometimes & in ellipses other times

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