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Station 5 Solar Systems
solar systems
34
Science
8th Grade
12/04/2007

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Term
star
Definition

A huge object in space made up of gas and giving off light and heat from nuclear reactions.

[image]

Term
Sun
Definition
The star around which the planets and other objects in the Milky Way Galaxy revolve.
Term
black hole
Definition

The remains from the death of star.It is so massive that not even light can escape its gravitational pull.

[image]

Term
comet
Definition
A body of ice, rock and dust that orbits the sun.[image]Shoemaker Levy 9
Term
air pressure
Definition
The measure of the force with which air particles push on a surface.
Term
altitude
Definition
The height of an object above sea level.
Term
atmosphere
Definition
The mixture of gases that surround the Earth.
Term
mesosphere
Definition

The middle layer of the Earth's atmosphere. 

It is the coldest layer.

 

[image] 

Term
stratosphere
Definition
The second lowest layer of the Earth's atmosphere.  It contains the protective ozone layer.
Term

trophosphere

Definition

[image]

The lowest layer of the Earth's atmosphere.  It is also the layer in which all weather occurs.

Term
weather
Definition
The conditions in the atmosphere at a particular time and place.
Term
exosphere
Definition
The outermost layer of the Earth's atmosphere.
Term
thermosphere
Definition
The hottest layer of the Earth's atmosphere.
Term
conduction
Definition
The transfer of heat from a warmer substance to a cooler one through direct contact.
Term
radiation
Definition
The transfer of heat through matter or space as waves.
Term
astronomy
Definition
The study of all physical objects beyond Earth.
Term
spiral galaxy
Definition

[image]

 A galaxy with a bulge in the center and distinctive spiral arms.

Term
nebula
Definition
A large cloud of gas and dust in space where stars form.
Term
elliptical galaxy
Definition
A spherical or elongated-shaped galaxy.
Term
Milky Way Galaxy
Definition
The name of the galaxy in which we live.
Term
Light year
Definition
A measure of how long it takes light to travel through space in one year
Term
magnitude
Definition
A measure of how bright a star is
Term
gravity
Definition
The force of attraction between two objects
Term
momentum
Definition
The movement an object has due to its mass and velocity.
Term
friction
Definition
A force that resists the motion between two objects that are touching.
Term
acceleration
Definition
The rate at which an object's speed and/or direction changes over time
Term
velocity
Definition
A object's speed and direction.
Term
velocity
Definition
A object's speed and direction.
Term
speed
Definition
The distance traveled by an object in a given amount of time. S=d/t
Term
motion
Definition
A change in the position of an object.
Term
inertia
Definition
The tendency of an object to resist a change in motion.
Term
force
Definition
A push or a pull.
Term
balanced forces
Definition
Occurs when the net force on an object equals zero and the object's motion does not change as a result
Term
unbalanced forces
Definition
Occurs when the net force on object does not equal zero, resulting in a change in the motion of the object.
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