Earth and Other Planets Moving in Space Module A Chapter 1 Grade 4
Dec 24, 2015
Earth and Other PlanetsMoving in Space
Module A
Chapter 1
Grade 4
Moving EarthRevolution: One full orbit (time) around the sun.
One revolution takes 1 year
Rotation: Earth spinning on its axis.
One rotation is called a day.
When ½ the earth is dark, the other ½ is light because of the earth’s rotation.
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The Force of Gravity
Gravity█ Can’t see it or touch it.
always present█ The greater the distance
between 2 objects, the weaker the force of gravity
█ The closer the distance between 2 objects, the stronger the force of gravity between them.
Mass The amount of matter
an object contains is it’s mass.
The greater the mass between 2 objects the greater the force of gravity between them.
Gravity & Mass
• The force that pulls the moon around the Earth is called gravity.
• The moon orbits the Earth because of the pull of gravity.
• The Earth moves easily around the sun because the Earth has less mass.
The sun and Earth are called a system because they work together.
Eclipse
Lunar Eclipse
A lunar eclipse occurs when the Earth blocks sunlight from reaching the moon.
Solar Eclipse
A solar eclipse occurs when the moon blocks sunlight from reaching Earth.
The Earth spins around on its:
• rotation?
• Revolution?
•Axis?
Axis
The Earth goes around the….
• Milky Way
• Orbits
• Sun
Sun
What occurs when the Earth blocks sunlight from reaching
the moon?
• A rotation?
• A revolution?
• A lunar eclipse?
Lunar Eclipse!
Earth moves more easily than the sun because Earth has less
• People
• Force
• Planets
• Mass
Mass
One rotation of the Earth is a
• Century
• Day
• Month
• Year
day
The moon moves in a curved orbit around the Earth because
of…….
• Force
• Gravity
• Solar eclipse
Gravity
The shape of the moon at night that we see depends on….
• The moon’s position as it orbits Earth
• The position of the sun and the moon
• The moon’s spin
The moon’s position as it orbits Earth
Which describes a solar eclipse?
• The moon blocks sunlight from reaching the earth.
• The Earth blocks sunlight from reaching the moon.
The moon blocks sunlight from reaching the Earth.