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Grade 9 Science Exam Review- 2
Section D from your exam outline
Vocabulary.
1. A small orbiting object made from dust and ice.
_________________
2. The collective term for the sun, moon, stars, and planets.
_________________
3. The unit of measurement for distances in our solar system.
__________________
4. The field around a celestial body. (The field weakens
as you get farther away from the celestial body.)
__________________
5. A piece of rock or dust in space. When it enters our atmosphere __________________
we see it as a shooting star!
6. A distinctive (unique) star pattern.
__________________
7. The region of space between the planets of our solar system.
__________________
8. An officially recognized group of stars
__________________
9. It consists of the Sun and other celestial objects,
held by the Sun’s gravitational field.
__________________
14. A five billion year old star
(has seven times the mass of the average star)
__________________
15. One of the two days of the year when the Sun is at its
greatest distance from Earth.
__________________
16. One of the two days of the year when the Sun spends an
equal amount of time above and below the horizon.
__________________
True or False
1. There are approximately 6000 stars visible to the unaided eye. _______________
2. The closest stars to the Earth are the brightest.
_______________
3. Only Planets have gravity.
_______________
4. The Sun is a 1 solar mass star.
_______________
5. A Red star is hotter than a Blue star.
_______________
6. Main Sequence stars are considered to be in a stable state.
_______________
7. Gravitational forces get stronger with distance.
_______________
8. A Nebula is the ending stage of a star.
_______________
9. Geological evidence puts the age of some rocks on Earth
_______________
at over 4.6 billion years.
10. Gravity can only attract, never repel.
_______________
Fill in the blanks.
1. _______________ is a nuclear reaction that transforms hydrogen into helium.
It occurs at 10 000 000 °C.
2. Star mass is expressed in terms of __________________.
3. A star’s ____________________ is the measure of the total amount of energy a star
radiates per second.
4. A massive shockwave that happens when a star’s core collapses is called a
______________________.
5. A _______________________ is the result of stellar winds peeling away at a stars
gases, revealing its inner region.
6. Astronomers use a _____________________to analyze starlight to indicate a stars
composition.
7. ____________________ are vast clouds of gas and dust.
Answer the following questions using full sentences.
1. How did knowledge of astronomy help early people
plan the activities in their daily lives?
2. Describe how our Solar System was created.
3. Describe space exploration as it applies to STSE. ( science, technology, Society and
the Environment) Include an opening statement about space exploration!
4. Give two reasons why one star may seem brighter than another.
5. The following stages of the formation of the Solar System are
out of order. Put numbers in the blanks showing the correct order.
_____ The rotation rate of the cloud increases.
_____ In orbit around the center, gas and dust start increasing in mass.
_____ The star “Turns on!”
_____ The nebula flattens. Interstellar material collapses into the center.
_____ The temperature of the core increases.
_____ A cloud of gas and dust begins contracting.
_____ The temperature at the core reaches 10 000 000 °C.
Multiple Choice.
1. A constellation is:
a) A distinctive (unique) star pattern.
b) An officially recognized group of stars.
c) Spiral galaxies.
2. One planetary year is:
a) The amount of time it takes the planet to spin once.
b) The amount of time it takes the planet to orbit the sun.
c) The amount of time it takes the moon to orbit the Earth.
3. Technology is described as:
a) The designing and use of devices to solve practical problems.
b) A way of knowing about nature that values knowledge.
c) Any factor that will influence the outcome of an experiment.
4. Interplanetary means:
a) The space between the planets of our solar system.
b) The field around a celestial body.
c) The collective term for the sun, moon, stars, and planets.
5. The field around a celestial body. (The field weakens
as you get farther away from the celestial body.):
a) Speed of Light
b) Atmosphere
c) Gravity
6. Fragments of Rock that are tough enough to breach our atmosphere and
strike the Earth are called:
9. If a star was 10 times the solar mass of our
a) asteroids
Sun, it would be:
b) meteorites
a) 100 solar masses
c) comets
b) 150 solar masses
c) 10 solar masses
7. A planet’s gravitational force is determined by its:
a) spin
10. This causes a shrinking, rotating nebula to
b) mass
flatten:
c) color
a) stellar winds
b) gravity
8. A telescope…
c) black holes
a) Collects light
b) Repels light
11. Our Sun is estimated to be:
c) Creates light
a) 5 billion years old
b) 3 billion years old
c) 15 billion years old
12. The size or radius of a star can be
calculated by knowing:
a) its temperature
b) its luminosity
c) both a and b