1. 1.the parts of the solar system 2 we live on the planet earth vocabulary planet a large, solid...
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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 4
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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 sun9
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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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Closer planets have smaller orbits.
Planets far from the sun have large orbits
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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
planets12
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Without gravity, the planets would drift into space
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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
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Vocabulary
Moons
A small object in orbit with a planet
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There are more than 50 moons orbiting the planets of the solar
system
Each moon is held in orbit by the gravity between the moon
and its planet
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One moon orbitsEarth
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Asteroids and comets are smaller objects in the solar
system
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Vocabulary
Asteroids
An object made of rock and metal that orbits the
sun
Asteroids orbit the sun in a belt between the planets Mars
& Jupiter
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Vocabulary
Comet
An object made of ice, gas, and dust that orbits
the sun
A comet has a bright fiery head and a long tail of light
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Comets have very large orbits and travel to the edge of the
solar system