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1. Kate is building a model of the solar
system. In her model, Kate used a tiny
bead to represent Earth and a giant
beach ball to represent the sun. Why
did Kate choose these objects for her
model?
A. because the sun is denser than the
Earth
B. because the sun is brighter than the
Earth
C. because the sun is greater in size
and mass than the Earth
D. because the sun is a gas giant
planet, and the Earth is a terrestrial
planet
ANSWER: C
2. Which process causes a star to give
off light?
A. nuclear fusion
B. condensing gases
C. exposing core
D. starmation
ANSWER: A
3. Fill in the blanks.
A ___________ exists before a star
forms. A star forms due to
____________________.
5. Name the gas giant planets.
ANSWER: Jupiter, Saturn, Uranus,
Neptune
6. What is the difference between the
sizes of the terrestrial and gas giant
planets?
ANSWER: Terrestrial planets are
smaller than gas giant planets.
7. What is the difference between the
distance between the terrestrial and gas
giant planets?
ANSWER: The distances between the
gas giant planets are much larger
than the distances between the
terrestrial planets.
8. What is the difference between the
structure of the terrestrial and gas giant
planets.
ANSWER: Terrestrial planets are
rocky and small with a thin gaseous
atmosphere. Gas giant planets have
a small rocky core with a thick
gaseous atmosphere. Gas giants
also have rings and more that 10
moons each.
ANSWER: nebula, nuclear fusion
9. Name 2 things larger than Saturn but
smaller than a galaxy.
4. Name the terrestrial planets.
ANSWER: Jupiter, sun, solar system
ANSWER: Mercury, Venus, Earth,
Mars
10. Place the following objects in order
from smallest to largest: star, solar
system, moon, galaxy, universe, cluster
ANSWER: moon, star, solar system,
galaxy, cluster, universe
16. What is a galaxy?
ANSWER: A large collection of gas,
dust, and stars held together by
gravity.
17. What is the universe?
11. What is nuclear fusion?
ANSWER: Nuclear fusion is the
process where the nuclei of small
atoms combine to form a more
massive nucleus.
12. What is a star?
ANSWER: A star is a large celestial
body composed of gas and emits
light.
13. List the planets in order from their
distance from the sun.
ANSWER: Mercury, Venus, Earth,
Mars, Jupiter, Saturn, Uranus,
Neptune
14. List and draw the three types of
galaxies.
ANSWER:
ANSWER: Space and all the matter
and energy in it
18. Fill in the blanks.
When a ____________ orbits a central
_____________ it is called a
_____________. This is found in a
_____________ and ours is called the
Milky Way. Billions of these make up
the ____________.
ANSWER: planet, star, solar system,
galaxy, universe
19. What is the difference between a
planet and a star?
ANSWER: A planet orbits a center
star and a planet is composed of
gas, liquid, and solid. A star is
composed of gas and creates light.
20. Is the sun a star, planet, or galaxy?
Explain your answer.
Spiral
Elliptical
Irregular
15. What is a solar system?
ANSWER: A center star and all the
planets and other bodies that travel
around it
ANSWER: The sun is a star because
it has planets orbiting around it, it
creates light using nuclear fusion,
and is composed of gas.