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Astro 7N Exam 1 Questions (2026/2027) Complete
Exam Questions and Answers | already graded A+
What was Kepler's first law? - ANSWER -Planets revolve around the sun
in elliptical orbits with Sun at one focus of the ellipse
Two planets have the same radius. If Planet A is 5 times more massive
than Planet B, how does gravity differ on the surfaces of the two
planets?
A: gravity is 5 times stronger on Planet B
B: gravity is 5 times stronger on Planet A
C: gravity is 25 times stronger on Planet A
D: gravity is 25 times stronger on Planet B
E: gravity is equal on Planet A and Planet B - ANSWER -B: gravity is 5
times stronger on Planet A
what best describes the orbit of the earth around the sun? - ANSWER -
an ellipse that is close to being circular
Say that there were a planet X in our Solar System with a mass 1/4 the
mass of Earth and a radius 1/2 the radius of Earth. How will the gravity
on its surface compare to the surface gravity of Earth?
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A: surface gravity on planet X is 2 times weaker than on Earth
B: surface gravity on planet X is 2 times stronger than on Earth
C: surface gravity on planet X is the same as on Earth
D: surface gravity on planet X is 8 times stronger than on Earth
E: surface gravity on planet X is 4 times weaker than on Earth -
ANSWER -C: surface gravity on planet X is the same as on Earth
which of the following does Kepler's Second law support? When a
planet is closer to the sun its speed is ----- than when its far away -
ANSWER -when a planet is closer to the sun, its speed is greater than
when its far away.
A planet in a nearly circular orbit with its rotation axis tilted by 5
degrees relative to its orbital plane around its star would ...
A: have longer days and nights than those of Earth
B: have very severe seasons compared to Earth
C: have shorter years than those of Earth
D: have shorter days and nights than those of Earth
E: have seasons that are not very different from each other as
compared to Earth's. - ANSWER -E: have seasons that are not very
different from each other as compared to Earth's.
how did Kepler himself originally state the second law? - ANSWER -a
line joining a planet and the sun sweeps out equal areas in equal
intervals of time
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what was Kepler's third law - ANSWER -The square of the time period
for an orbit of a planet is proportional to cube of its average distance
from Sun (in other words P^2 is proportional to a^3
The rotation axis of the Earth is ...
A: tilted so that it is always pointed directly at the Sun
B: is sometimes parallel and sometimes perpendicular to the axis of the
Earth's orbit around the Sun.
C: tilted at about 23 degrees relative to the axis of the Earth's orbit
around the Sun.
D: perpendicular to the axis of the Earth's orbit around the Sun.
E: parallel to the axis of the Earth's orbit around the Sun. - ANSWER -C:
tilted at about 23 degrees relative to the axis of the Earth's orbit around
the Sun.
In the diagram above, what season and planet is being represented by
the red X on the planet on the left in orbit around the Sun?
A: winter on Earth
B: summer on Earth
C: winter on Venus
D: winter on Uranus
E: summer on Uranus - ANSWER -E: summer on Uranus
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Besides, the discovery that moons orbit Jupiter, what other discovery
made by Galileo Galilei, with an early telescope, proved that the Earth is
not at the center of the Universe? - ANSWER -the phases of venus
When is the waning gibbous moon highest in the sky?
A: about 9:00am
B: about 3:00am
C: about noon
D: about midnight
E: about 3:00pm - ANSWER -B: about 3:00am
We saw that Kepler's 3rd law states that P^2/a^3 = constant. What does
P represent in this equation? - ANSWER -orbital period, in this case
how long it takes for a satellite to orbit Jupiter
What phase is the Moon in, when observed by the person standing on
the Earth in the diagram above? A: New
B: Third Quarter
C: Waning Gibbous
D: Full
E: First Quarter - ANSWER -B: Third Quarter
of the four Galilean moons which is closest to Jupiter - ANSWER -Io
Astro 7N Exam 1 Questions (2026/2027) Complete
Exam Questions and Answers | already graded A+
What was Kepler's first law? - ANSWER -Planets revolve around the sun
in elliptical orbits with Sun at one focus of the ellipse
Two planets have the same radius. If Planet A is 5 times more massive
than Planet B, how does gravity differ on the surfaces of the two
planets?
A: gravity is 5 times stronger on Planet B
B: gravity is 5 times stronger on Planet A
C: gravity is 25 times stronger on Planet A
D: gravity is 25 times stronger on Planet B
E: gravity is equal on Planet A and Planet B - ANSWER -B: gravity is 5
times stronger on Planet A
what best describes the orbit of the earth around the sun? - ANSWER -
an ellipse that is close to being circular
Say that there were a planet X in our Solar System with a mass 1/4 the
mass of Earth and a radius 1/2 the radius of Earth. How will the gravity
on its surface compare to the surface gravity of Earth?
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A: surface gravity on planet X is 2 times weaker than on Earth
B: surface gravity on planet X is 2 times stronger than on Earth
C: surface gravity on planet X is the same as on Earth
D: surface gravity on planet X is 8 times stronger than on Earth
E: surface gravity on planet X is 4 times weaker than on Earth -
ANSWER -C: surface gravity on planet X is the same as on Earth
which of the following does Kepler's Second law support? When a
planet is closer to the sun its speed is ----- than when its far away -
ANSWER -when a planet is closer to the sun, its speed is greater than
when its far away.
A planet in a nearly circular orbit with its rotation axis tilted by 5
degrees relative to its orbital plane around its star would ...
A: have longer days and nights than those of Earth
B: have very severe seasons compared to Earth
C: have shorter years than those of Earth
D: have shorter days and nights than those of Earth
E: have seasons that are not very different from each other as
compared to Earth's. - ANSWER -E: have seasons that are not very
different from each other as compared to Earth's.
how did Kepler himself originally state the second law? - ANSWER -a
line joining a planet and the sun sweeps out equal areas in equal
intervals of time
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what was Kepler's third law - ANSWER -The square of the time period
for an orbit of a planet is proportional to cube of its average distance
from Sun (in other words P^2 is proportional to a^3
The rotation axis of the Earth is ...
A: tilted so that it is always pointed directly at the Sun
B: is sometimes parallel and sometimes perpendicular to the axis of the
Earth's orbit around the Sun.
C: tilted at about 23 degrees relative to the axis of the Earth's orbit
around the Sun.
D: perpendicular to the axis of the Earth's orbit around the Sun.
E: parallel to the axis of the Earth's orbit around the Sun. - ANSWER -C:
tilted at about 23 degrees relative to the axis of the Earth's orbit around
the Sun.
In the diagram above, what season and planet is being represented by
the red X on the planet on the left in orbit around the Sun?
A: winter on Earth
B: summer on Earth
C: winter on Venus
D: winter on Uranus
E: summer on Uranus - ANSWER -E: summer on Uranus
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Besides, the discovery that moons orbit Jupiter, what other discovery
made by Galileo Galilei, with an early telescope, proved that the Earth is
not at the center of the Universe? - ANSWER -the phases of venus
When is the waning gibbous moon highest in the sky?
A: about 9:00am
B: about 3:00am
C: about noon
D: about midnight
E: about 3:00pm - ANSWER -B: about 3:00am
We saw that Kepler's 3rd law states that P^2/a^3 = constant. What does
P represent in this equation? - ANSWER -orbital period, in this case
how long it takes for a satellite to orbit Jupiter
What phase is the Moon in, when observed by the person standing on
the Earth in the diagram above? A: New
B: Third Quarter
C: Waning Gibbous
D: Full
E: First Quarter - ANSWER -B: Third Quarter
of the four Galilean moons which is closest to Jupiter - ANSWER -Io
