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Solar System
Unit D , Chapter 3
50
Science
4th Grade
12/17/2010

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Cards

Term
A --- is a group of objects in space that move around a central star.
Definition
Solar System
Term
The --- is the source of almost all the energy in our solar system.
Definition
sun
Term
What does the Sun provide to Earth?
Definition
light and heat
Term
What is our solar system made up of?
Definition
the Sun, nine planets, the planets' moons, asteroids, and comets
Term
The --- is a star (a burning sphere).
Definition
Sun
Term
All the objects in a solar system revolve around a ---.
Definition
star (sun)
Term
A --- is a large object that moves around a star.
Definition
planet
Term
Each planet revolves in an elliptical --- around the sun and rotates on its own axis.
Definition
orbit
Term
An --- is the imaginary line that run through both poles of a planet that it rotates around.
Definition
axis
Term

The planets that are closest to the Sun) are called the

--- planets.

Definition
inner
Term
The four inner planets are:
Definition
Mercury, Venus, Earth, and Mars
Term
Earth is the --- planet from the Sun.
Definition
third
Term
How many natural satellite does Earth have?
Definition
one
Term
--- is the only planet with water.
Definition
Earth
Term
The --- is a natural satellite of Earth.
Definition
Moon
Term
--- are the changes in apparent shape of the moon.
Definition
Phases
Term
Why does the moon appear to glow?
Definition
The moon reflects light from the Sun.
Term
Why does the apparent shape of the moon change?
Definition
As the moon moves through its orbit around earth different amounts of its lit half can be seen from Earth.
Term
How long is one of the moon's phases?
Definition
28 days
Term
Moon's gravity causes --- on Earth.
Definition
tides
Term
--- are the daily changes in the local water level of the ocean.
Definition
Tides
Term
The five outer planets are:
Definition
Jupiter, Saturn, Uranus, Neptune, and Pluto
Term
--- --- are large spheres made up mostly of gases.
Definition
Gas Giants
Term
Which planets are considered "Gas Giants"?
Definition
Four of the five outer planets (Jupiter, Saturn, Uranus, Neptune)
Term
What are the rings on the Gas Giants made of?
Definition
tiny bits of dust, ice crystals and small pieces of rocks
Term
Planets that are closer to the Sun orbit --- than the outer planets.
Definition
faster
Term
--- is the spinning movement of planets.
Definition
Rotation
Term
--- is the movement of a planet in orbit around the sun.
Definition
Revolution
Term
Earth takes --- to complete a revolution around the Sun.
Definition
365 1/4 days
Term
An --- is the path an object takes when revolving around the another object.
Definition
orbit
Term
--- are small and rocky objects that move around the Sun.
Definition
Asteroids
Term
Most asteroids are scattered between --- and---.
Definition
Mars and jupiter
Term
A --- is a small mass of dust and ice that orbits the Sun.
Definition
comet
Term
A --- is an object that moves around another object.
Definition
salellite
Term

Every planet except

--- and--- has at least one moon.

Definition
Mercury and Venus
Term
A --- is a tool people use to observe distant objects.
Definition
telescope
Term
A --- telescope works the way optical telescopes do but instead of collecting and focusing light they collect and focus invisible radio waves.  These telescopes are not affected by bad weather.
Definition
radio
Term
A --- telescopes collects and focuses light.
Definition
optical
Term
--- optical telescopes use mirrors to magnify an object.
Definition
Reflecting
Term
--- optical telescopes use lenses to magnify an object.
Definition
Refracting
Term
A --- --- are vehicles sent to explore space equipped with cameras, instruments, and other tools.
Definition
space probe
Term
Why are space probes sent out instead of sending people out?
Definition
They are sent because of the danger and the distance. 
Term
What types of information do space probes get?
Definition
Space probes gather ojbects and data which is sent back and studied.  Examples of objects and data include rocks and pictures.
Term
What are the limitations of a crewed mission?
Definition
A crewed mission is limited because a crew needs food, water and an oxygen supply.
Term
How is information gathered by space probes valuable to scientist?
Definition
Scientists study condition in other parts of our solar system to learn about the formation of stars and planets.  It also helps develop technology that can be used on Earth. 
Term
What have scientists learn from studying Mars?
Definition
Scientists may have learned that liquid water may have once existed therebecause there are sedimentary rocks on Mars.
Term
Because Earth is tilted on its axis and revolves around the Sun, we have...
Definition
seasons
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