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Grade 9 Academic Science - Space
Space – Definitions #1
This information will help you practice and recall information you have gathered and put into your brain.
NOTE: Recall is a major component of learning. You must find the methods and processes that work
best for you to recall information effectively.
A trick about memorizing terms: The human brain (…your brain…) can only learn so many things at a
time. The average number of things is seven (…guess why your telephone number is seven digits
long…). To make memorizing these terms easier, you may wish to do only one page at a time. Learn all
the terms, go away, two hours later try and do the page again by testing your recall. If you can do Page 1
correctly, go to Page 2. Repeat this process for all pages. As well, come back and do Page 1 again. It
may work.
The following terms are definitions from the SPACE unit. You are asked to match the definition with the
term AND write a sentence that uses the term in context to demonstrate your understanding of the term.
All terms are found in the textbook Science: Perspectives 9 on pages 296-455
Term
Your
Answer
Definition
Geocentric
Model
1. Everything that exists including all matter, energy and space
Light Year
2. A large chunk of ice, rock and dust that orbits the Sun
Outer
Planets
3. The distance light travels in one year
Universe
4. A meteoroid that burns up as it travels through Earth’s atmosphere. It
forms a bright streak of light in the night sky
Comet
5. Huge rotating collections of gas, dust, stars, planets and other celestial
objects
Heliocentric
Model
6. Angular distance on the horizon starting at 0O (North) and moving
eastward to a point that is directly below a celestial body (e.g., star)
Galaxy
7. Model of the Universe in which the Sun is at the centre
Retrograde
Motion
8. A dark area on the Sun’s surface that is cooler than the area surrounding
it
Solar Flare
9. Model of the Universe in which the Earth is at the centre
Inner Planets
10. Electrically-charged particles that flow from the Sun’s corona out into
space
Sunspot
11. They are known as the gas giants because they are made up mostly of
gas. The planets are Jupiter, Saturn, Uranus and Neptune
Solar Wind
12. The amount of energy released by a star each second.
Azimuth
13. Apparent east-west movement of an object in the sky…most often a
planet…that deviates from the normal west-east movement
Luminosity
14. Gases and charged particles that are blasted above the active region of
the Sun’s photosphere
Meteor
15. The four planets closest to the Sun. They are Mercury, Mars, Earth and
Venus. These planets have a solid surface made of rock.
Space #1 - Answers
Term
Your
Answer
Definition
Geocentric
Model
9
1. Everything that exists including all matter, energy and space
Light Year
3
2. A large chunk of ice, rock and dust that orbits the Sun
Outer
Planets
11
3. The distance light travels in one year
Universe
1
4. A meteoroid that burns up as it travels through Earth’s atmosphere. It
forms a bright streak of light in the night sky
Comet
2
5. Huge rotating collections of gas, dust, stars, planets and other celestial
objects
Heliocentric
Model
7
6. Angular distance on the horizon starting at 0O (North) and moving
eastward to a point that is directly below a celestial body (e.g., star)
Galaxy
5
7. Model of the Universe in which the Sun is at the centre
13
8. A dark area on the Sun’s surface that is cooler than the area
surrounding it
Solar Flare
14
9. Model of the Universe in which the Earth is at the centre
Inner Planets
15
10. Electrically-charged particles that flow from the Sun’s corona out into
space
Sunspot
8
11. They are known as the gas giants because they are made up mostly of
gas. The planets are Jupiter, Saturn, Uranus and Neptune
Solar Wind
10
12. The amount of energy released by a star each second.
Azimuth
6
13. Apparent east-west movement of an object in the sky…most often a
planet…that deviates from the normal west-east movement
Luminosity
12
14. Gases and charged particles that are blasted above the active region of
the Sun’s photosphere
Meteor
4
15. The four planets closest to the Sun. They are Mercury, Mars, Earth and
Venus. These planets have a solid surface made of rock.
Grade 9 Academic Science - Space
Space - Definitions # 2
The following terms are definitions from the SPACE unit. You are asked to match the definition with the
term AND write a sentence that uses the term in context to demonstrate your understanding of the term.
All terms are found in the textbook Science: Perspectives 9 on pages 296-455.
Term
Your
Answer
Definition
Absolute
Magnitude
1. Coloured lights in the sky produced when the solar wind comes in contact
with the Earth’s magnetic field and atmosphere
Solstice
2. A dense group of stars held together by gravity
Constellation
3. A measurement of how bright an object is when viewed from Earth; it
depends on luminosity and distance
Altitude
4. A measurement of how bright an object would be if it were 33 Light Years
from Earth
Meteor
5. The average distance between Earth and the Sun – about 150 million
kilometres
Apparent
Magnitude
6. A region of stars in the night sky such as Ursa Major or Great Bear (Note:
the Bigger Dipper is part of the Ursa Major region)
Circumpolar
7. A pattern of stars in the Earth’s night sky such as the Big Dipper
Azimuth
8. A star OR constellation that never sets below the horizon
Main
Sequence
9. In the Hertzsprung-Russell diagram, the stars…including our Sun…that
form a band from the upper right to the lower left
Astronomical
Unit (AU)
10. The angular height of a celestial object about the horizon
Star Cluster
11. The horizontal angular distance from North measured eastward along the
horizon to a point directly below a celestial object
Asterism
12. A massive space cloud in gas and dust where clouds are “born”
Nebula
13. A day when Earth’s axis is most inclined toward OR away from the Sun
Equinoxes
14. Days when the hours of daylight equal the hours of darkness
Aurora
15. A meteoroid that burns up as it travels through Earth’s atmosphere; it
forms a \bright streak of light in the night sky
Definitions – Space 2 - Answers
Term
Your
Answer
Definition
Absolute
Magnitude
4
1. Coloured lights in the sky produced when the solar wind comes in contact
with the Earth’s magnetic field and atmosphere
Solstice
13
2. A dense group of stars held together by gravity
Constellation
6
3. A measurement of how bright an object is when viewed from Earth; it
depends on luminosity and distance
Altitude
10
4. A measurement of how bright an object would be if it were 33 Light Years
from Earth
Meteor
15
5. The average distance between Earth and the Sun – about 150 million
kilometres
Apparent
Magnitude
3
6. A region of stars in the night sky such as Ursa Major or Great Bear (Note:
the Bigger Dipper is part of the Ursa Major region)
Circumpolar
8
7. A pattern of stars in the Earth’s night sky such as the Big Dipper
Azimuth
11
8. A star OR constellation that never sets below the horizon
Main
Sequence
9
9. In the Hertzsprung-Russell diagram, the stars…including our Sun…that
form a band from the upper right to the lower left
Astronomical
Unit (AU)
5
10. The angular height of a celestial object about the horizon
Star Cluster
2
11. The horizontal angular distance from North measured eastward along the
horizon to a point directly below a celestial object
Asterism
7
12. A massive space cloud in gas and dust where clouds are “born”
Nebula
12
13. A day when Earth’s axis is most inclined toward OR away from the Sun
Equinoxes
14
14. Days when the hours of daylight equal the hours of darkness
Aurora
1
15. A meteoroid that burns up as it travels through Earth’s atmosphere; it
forms a \bright streak of light in the night sky
Grade 9 Academic Science - Space
Space Definitions 3
The following terms are definitions from the SPACE unit. You are asked to match the definition with the
term AND write a sentence that uses the term in context to demonstrate your understanding of the term.
All terms are found in the textbook Science: Perspectives 9 on pages 296-455.
Term
Your
Answer
Definition
Gravitational
Force
1. A dense quantity of matter in space that does not emit light or matter
Phases of
the Moon
2. The explosion that occurs at the end of a star’s life
Solar Eclipse
3. The changing amount of illuminated Moon surface visible from Earth
Big Bang
Theory
4. Decreasing in size; a period during which the visible surface of the Moon
decrease
Supernova
5. A star nearing the end of its life with a mass more that 10X larger than
our Sun, and as it moves towards death, stops burning hydrogen fuel and
becomes red in colour
Red
Supergiant
6. Theory that the Universe began in an incredibly hot, dense expansion
about 14 billion years ago
Lunar Cycle
7. The force of attraction between two massive objects
Black Hole
8. Increasing in size; a period during which the visible surface of the Moon
increases
Solar Nebula
Theory
9. Light from a galaxy shifting toward the red end of the visible spectrum
Neutron Star
10. The start of the Solar System about 5 billion years ago when a massive
cloud of gas and dust contracted
Waxing
11. An environment in which objects behave as though there is very little
gravity affecting them
Microgravity
Environment
12. Occurs when a star over 10 solar masses collapses, it is an extremely
dense star made up of tightly packed neutrons
Lunar
Eclipse
13. When the Moon passes through the Earth’s shadow and does not reflect
as much sunlight as usual
Red Shift
14. When the Moon passes between the Sun and the Earth blocking some or
all of the Sun’s light
Waning
15. The sequences of phases made by the Moon during ONE ORBIT around
Earth
Space Definitions # 3 - Answers
Term
Your
Answer
Definition
Gravitational
Force
7
1. A dense quantity of matter in space that does not emit light or matter
Phases of
the Moon
3
2. The explosion that occurs at the end of a star’s life
Solar Eclipse
14
3. The changing amount of illuminated Moon surface visible from Earth
Big Bang
Theory
6
4. Decreasing in size; a period during which the visible surface of the Moon
decrease
Supernova
2
5. A star nearing the end of its life with a mass more that 10X larger than
our Sun, and as it moves towards death, stops burning hydrogen fuel and
becomes red in colour
Red
Supergiant
5
6. Theory that the Universe began in an incredibly hot, dense expansion
about 14 billion years ago
Lunar Cycle
15
7. The force of attraction between two massive objects
Black Hole
1
8. Increasing in size; a period during which the visible surface of the Moon
increases
Solar
Nebular
Theory
10
9. Light from a galaxy shifting toward the red end of the visible spectrum
Neutron Star
12
10. The start of the Solar System about 5 billion years ago when a massive
cloud of gas and dust contracted
Waxing
8
11. An environment in which objects behave as though there is very little
gravity affecting them
Microgravity
Environment
11
12. Occurs when a star over 10 solar masses collapses, it is an extremely
dense star made up of tightly packed neutrons
Lunar
Eclipse
13
13. When the Moon passes through the Earth’s shadow and does not reflect
as much sunlight as usual
Red Shift
9
14. When the Moon passes between the Sun and the Earth blocking some or
all of the Sun’s light
Waning
4
15. The sequences of phases made by the Moon during ONE ORBIT around
Earth