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Planets and Orbits (review)

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.
The closer a planet is to its host star: 
a)
the shorter the orbital period.
b)
the longer the semi-major axis.
c)
the colder the temperature.
d)
the more eccentric the orbit.
2.
A habitable planet could possibly contain:
a)
oxygen.
b)
flaming hot Cheetos.
c)
liquid water.
d)
ET's family.
3.
A planet with a very eccentric orbit:
a)
is Venus.
b)
will most likely contain liquid water.
c)
has a much shorter year than Earth.
d)
will experience very extreme temperature changes.
4.
Eccentricity is equal to:
a)
'c' times 'a'
b)
'a' divided by 'c'
c)
'c' divided by 'a'
d)
mc2
5.
Which of the following would increase the force of gravity on a planet?
a)
Decreasing the mass of the star.
b)
Decreasing the distance between the planet and star.
c)
Decreasing the mass of the planet.
d)
All of the above.
6.

For all of the planets in our Solar system:

a)

a = 1 AU

b)

p = 3.14

c)

eccentricity = 0.02

d)

p2 = a3

7.
The larger the star, the __________________ the habitable zone.
a)
larger
b)
smaller
c)
closer to the star
d)
further away from the star
8.
a)
0.5
b)
0.6
c)
1.67
d)
3.75
9.
An exoplanet is:
a)
a planet that is about to supernova.
b)
any planet outside of our Solar System.
c)
too small to be a regular planet - like Pluto :(
d)
usually very similar to Earth.
10.
In an ellipse:
a)
'a' is always less than 'c'.
b)
the eccentricity is always more than 1.
c)
the two foci are always the same distance from the center.
d)
All of the above.
11.
Within its orbit, as the planet gets closer to its host star:
a)
the planet speeds up.
b)
the force of gravity on the planet increases.
c)
the temperature of the planet increases.
d)
all of the above.
12.
Earth is traveling the fastest during the month(s) of:
a)
January.
b)
July.
c)
September through October.
d)
February through March.
13.
All of the exoplanets we have discovered so far are:
a)
gas giants.
b)
very similar to Earth.
c)
inside of the Milky Way Galaxy.
d)
habitable.
14.
Which of the following statements about the Trappist-1 system is false?
a)
Each planet has an orbital period of just a few days.
b)
Most of the planets would have a 24-hour day, just like Earth.
c)
Several of the planets are in the habitable zone.
d)
The Trappist system is about 39 lightyears from Earth.
15.

Astronomers are interested in a large object at the edge of the asteroid belt, 4 AU from the Sun. What would the orbital period of that object be?

a)

2 years

b)

4 years

c)

8 years

d)

12 years

16.
The semi-major axis of an elliptical orbit:
a)
is always between 0 and 1.
b)
is equal to the average distance between the planet and star.
c)
describes how streched out the orbit is.
d)
can be measured using a reeealy long tape measure.
17.
The orbital period of a planet:
a)
depends on how far away from the star it is.
b)
describes how long "one year" would be on that planet.
c)
is how long it takes the planet to go around its star.
d)
all of the above.
18.
If the Earth were orbiting a much larger star, like Canis Majoris for example:
a)
Earth's orbital period would be much greater.
b)
the semi-major axis of Earth's orbit would be much smaller.
c)
the eccentricity of Earth's orbit would increase.
d)
all of the above.
19.
Which of these would be not be true of life in the Trappist planet system?
a)
You would be able to see what the weather is like on neighboring planets just by looking up.
b)
You would have to choose to live on the side that was either always daytime or always nighttime.
c)
A year would only be a about a week or two long.
d)
It would be so hot that your skin would boil away without a spacesuit.
20.

Kepler's 2nd Law state that, if you draw a imaginary line from the Sun to a planet:

a)

it will sweep out an equal amount of space (area) in an equal amount of time.

b)

the length of the line will equal the eccentricity.

c)

the line will always be the same length.

d)

it will point to Never Never Land.

21.

What is true about the orbit pictured?

a)

The planet is traveling at the same speed in both shaded sections.

b)

Both of the shaded sections have the same area.

c)

The eccentricity of the orbit is close to zero.

d)

There is no gravity acting on the planet.

22.

What is the relationship between an object's mass and the force of gravity?

a)

direct (as one changes, the other changes in the same way)

b)

indirect (as one changes, the other changes in the opposite way)

c)

just friends

d)

"talking"

23.

The gravitational force between a star and a planet orbiting the star is the greatest when:

a)

the planet is at aphelion (farthest from the star)

b)

the planet is at perihelion (closest to the star)

c)

the planet is habitable

d)

the eccentricity is close to 1

24.

The semi-major axis of Earth's orbit is:

a)

0

b)

0.017

c)

1

d)

2

25.

Which of the following pieces of information can be determined from looking at a transit graph?

a)

semi-major axis

b)

eccentricity

c)

habitability

d)

orbital period

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