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Science-Astronomy Essential Facts
Science-Astronomy Essential Facts
36
Science
4th Grade
01/07/2014
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Term
All planets
 Definition
orbit or move around the sun.
Term
Planets are
 Definition
satellites that orbit the sun.
Term
The sun is located
 Definition
in the center of our solar system
Term
The sun is
 Definition
is a large ball of hot, glowing gases.
Term
Earth, Mercury, Venus, Mars, and Pluto are
 Definition
rocky planets.
Term
Jupiter, Saturn, Neptune, Uranus are
 Definition
all made of gas.
Term
Planet order:
 Definition
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.
Term
Earth has
 Definition
a rocky surface and has water.
Term
Earth is surrounded
 Definition
by an atmosphere made of gases.
Term
The moon orbits
 Definition
the Earth.
Term
The moon has
 Definition
a rocky, dusty surface along with many craters. It does not have water or an atmosphere.
Term
A crater is
 Definition
a bowl-shaped hole, usually found on the moon, created by a meteorite.
Term
The sun is a star that
 Definition
gives off 2 kinds of energy called heat and light.
Term
The sun’s energy is stored
 Definition
in the earth as fossil fuels.
Term
Coal, oil, and gas are
 Definition
forms of fossil fuels.
Term
The sun’s energy
 Definition
affects weather on Earth.
Term
A revolution
 Definition
is the movement of Earth as it makes one trip around the sun.
Term
It takes Earth 365 days or one year to
 Definition
revolve around the sun one time.
Term
Earth spins on
 Definition
an imaginary line called an axis. It runs through the center of the planet.
Term
It takes Earth 24 hours or 1 day to
 Definition
rotate or spin on its axis.
Term
A rotation is the movement of Earth
 Definition
as it spins on its axis.
Term
Earth has seasons because
 Definition
the Earth’s axis is tilted and because the Earth revolves around the sun.
Term
Summer occurs when part of the Earth is
 Definition
tilted toward the sun.
Term
Winter occurs when part of the Earth is
 Definition
tilted away from the sun.
Term
The moon reflects
 Definition
the sun’s light. It does not make its own light.
Term
The moon goes through
 Definition
phases where the moon appears to change shape.
Term
A new moon occurs
 Definition
when the side of the moon facing Earth is completely dark.
Term
A quarter moon occurs
 Definition
when ½ of the side of the moon facing Earth is lighted and the other ½ is dark.
Term
A full moon occurs
 Definition
when the side of the moon facing Earth is lighted.
Term
A crescent moon occurs
 Definition
when less than ½ of the side of the moon facing Earth is lighted.
Term
It takes the moon 29½ (about 1 month or 4 weeks) days to
 Definition
go through all of its phases (from new moon to new moon).
Term
Gravity is
 Definition
a force that pulls objects downwards.
Term
The ocean tides are the results of
 Definition
the moon’s and Earth’s gravity pulling on each other.
Term
Shadows change size throughout the day due to
 Definition
Earth’s rotation.
Term
A telescope is
 Definition
an instrument used to study objects in outer space.
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