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ASTRO 7N EXAM 1 2026 100% PASS
ASSURED EXAMINATION SOLUTIONS
What two properties of a planet affect the
gravity we feel on its surface? - correct
answer- mass and radius
What was Kepler's first law? - correct 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 -
correct answer- B: gravity is 5 times stronger
on Planet A
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what best describes the orbit of the earth
around the sun? - correct 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?
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 - correct 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
- correct answer- when a planet is closer to
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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. -
correct 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? - correct answer- a line joining a
planet and the sun sweeps out equal areas in
equal intervals of time
what was Kepler's third law - correct answer-
The square of the time period for an orbit of
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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. - correct 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
ASTRO 7N EXAM 1 2026 100% PASS
ASSURED EXAMINATION SOLUTIONS
What two properties of a planet affect the
gravity we feel on its surface? - correct
answer- mass and radius
What was Kepler's first law? - correct 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 -
correct answer- B: gravity is 5 times stronger
on Planet A
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what best describes the orbit of the earth
around the sun? - correct 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?
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 - correct 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
- correct answer- when a planet is closer to
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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. -
correct 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? - correct answer- a line joining a
planet and the sun sweeps out equal areas in
equal intervals of time
what was Kepler's third law - correct answer-
The square of the time period for an orbit of
, 4 | Page
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. - correct 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
