# How many centimeters are there in one kilometer

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```					QUESTION

How many centimeters are there in one
kilometer?

1.   100
2.   1,000
3.   10,000
4.   100,000
5.   1106
QUESTION

Scientific notation is used in science
because

1. it makes it easy to write big or small
numbers.
2. all astronomical distances are
expressed in metric units.
3. it makes conversions between units
easy.
4. all of the above.
QUESTION

The average distance from Earth to the Sun is
1.   1 ly
2.   1 million km
3.   1 million miles
4.   1 billion km
5.   150 million km
QUESTION

The sun is

1.   a star which generates its own energy.
2.   1 AU from Earth.
3.   visible by its own light emission.
4.   all of the above.
QUESTION

2.9  107 is the same as

1.   2.9 thousand
2.   29 thousand
3.   290 thousand
4.   2.9 million
5.   29 million
QUESTION

Arrange the following distances in order
from smallest to largest.

I.     kilometer               1.   I, II, III, IV
II.    light-year              2.   IV, III, II, I
III.   yard                    3.   III, I, IV, II
IV.     Astronomical unit      4.   II, I, IV, III
5.   III, I, II, IV
QUESTION

If light takes 8 minutes to travel from the sun
to Earth and over 4 hours to travel from the
sun to the planet Neptune, what is the
distance from the sun to Neptune?
1.   5 AU
2.   30 AU
3.   30 ly
4.   5 ly
5.   0.6 ly
QUESTION

In the diagram below, what is the
diameter of Jupiter?
1.   About 7.0  104 km.
2.   About 7.0  105 km.
3.   About 1.4  104 km.
4.   About 1.4  105 km.
5.   About 3.5  106 km.
QUESTION

The speed of light is 3.0  105 km/sec, and it
takes light 1.3 sec for light to travel from the
moon to Earth. From this information, what
is the distance to the moon?

1.   390,000 km
2.   230,000 km
3.   3.9 km
4.   2.3 km
5.   4.3  105 km
QUESTION

A typical galaxy like our Milky Way galaxy
contains

1.   primarily planets.
2.   gas only.
3.   stars (some with planets), gas and dust.
4.   a single star and planets.
5.   thousands of superclusters.
QUESTION

The Milky Way Galaxy

1.   contains about 100 billion stars.
2.   is about 200 light-years in diameter.
3.   is the largest known object in the universe.
4.   all of the above.
5.   1 and 3.
QUESTION

The Milky Way Galaxy is

1. a spiral galaxy.
2. part of a cluster of galaxies that contains
a few dozen galaxies.
3. about 80,000 light years in diameter.
4. all of the above.
QUESTION

If the Earth were represented as a
basketball (~10 in) and the Moon as a
baseball (~3 in) then, to order of magnitude,
what size would best represent the diameter
of the Sun?
1.   10 ft
2.   100 ft
3.   1000 ft
4.   10000 ft
QUESTION

Which sequence is correct when ordered by
increasing size?

1. Earth, Solar System, Milky Way
Galaxy, clusters of galaxies
2. Solar System, Earth, galaxy clusters,
Milky Way Galaxy
3. Earth, Milky Way Galaxy, Solar
System, galaxy clusters
4. Galaxy clusters, Solar System, Milky
Way Galaxy, Earth
QUESTION

How is a planet different from a star?

1. Planets are larger than stars.
2. Planets reflect light while stars produce
their own light.
3. Stars move faster in the sky than planets.
4. Planets are brighter than stars.
QUESTION

If the distance from the Sun to the Earth is
represented by roughly 15 meters, then the
distance from the Earth to the Moon on the
same scale would be
QUESTION
Assume the size of the Sun is represented by a
softball with the Earth about 15 meters (150
million km or 8 light minutes) away. Roughly
how far away, to scale, would the nearest stars to
the Sun be?
1. About the distance between New York and
Boston (330 km).
2. 100 meters away.
3. About the distance across the United States
from New York to Los Angeles (4300 km).
4. About the distance across 50 football fields
(50 x 100 m).
QUESTION

If the distance to the nearest star is 4.2 light-
years, then
1. the star is 4.2 million AU away.
2. the light we see left the star 4.2 years
ago.
3. the star must have formed 4.2 billion
years ago.
4. the star must be very young.
5. the star must be very old.
QUESTION

Assume a 100 yard football field represents
the 14 billion year history of the universe
with one end as the origin and the other end
representing the present. The existence of
human beings will extend from _____ to the
present “goal line.”
1.   the 50 yard line
2.   the 5 yard line
3.   the one yard line
4.   the one inch line
QUESTION

Which of these is NOT a common
misconception?

1. A light year is a unit of time.
2. Stars look like disks when seen through
a telescope.
3. A galaxy is a star plus its planets.
4. All of the above are misconceptions.
QUESTION

The average distance from Earth to the Sun
is 1 AU.

1. True
2. False
QUESTION

A light-year is the distance light travels in
one year.
1. True
2. False
QUESTION

A kilometer contains 1 million meters.

1. True
2. False
QUESTION

The Sun is a star in the Milky Way Galaxy.

1. True
2. False
QUESTION

The metric system is a decimal system.

1. True
2. False
QUESTION

3.42  107 km is the same as 3.42  104 m.

1. True
2. False
QUESTION

The numbers 9.81  105 and 981,000 are
equivalent.

1. True
2. False
QUESTION

A supercluster refers to a large group of
stars within the Milky Way.

1. True
2. False

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