Download The Solar SysteM

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1. The Parts of the Solar System
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We live on the planet Earth
Vocabulary
Planet
A large, solid object that travels
around a star
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Earth is one of nine planets circling
a star we call the sun
The sun and the nine planets
make up our solar system
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Vocabulary
Solar system
The sun and the nine planets
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The most common theory of how
the solar system was formed was by
circulating gases and dust
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A chemical reaction occurred with
heat
to cause an explosion causing objects
to form during cooling
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Video Birth of a Solar System
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Each of the nine planets move in an
orbit around the sun
Vocabulary
Orbit
A curved path that each of the
planets moves around the sun
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The size of a planet’s orbit
depends on the distance of the planet
from the sun
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Planets far from the sun have large
orbits
Closer planets have smaller orbits.
Mercury
Venus
Earth
Mars
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All the planets are held in orbit by a
force called gravity
Vocabulary
Gravity
A force that acts like a pull
between the sun and planets
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Without gravity, the planets would
drift into space
The space shuttles sent to space by
NASA are held into orbit around the
Earth by gravity
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Some planets have smaller objects
called moons
Vocabulary
Moons
A small object in orbit with a
planet
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Each moon is held in orbit by the
gravity between the moon and its
planet
There are more than 50 moons
orbiting the planets of the solar
system
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One moon orbits
Earth
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Asteroids and comets are smaller
objects in the solar system
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Asteroids orbit the sun in a belt
between the planets Mars & Jupiter
Vocabulary
Asteroids
An object made of rock and
metal that orbits the sun
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A comet has a bright fiery head and a
long tail of light
Vocabulary
Comet
An object made of ice, gas, and
dust that orbits the sun
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Comets have very large orbits and
travel to the edge of the solar system
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