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.