Earth and Space

What keeps Earth revolving around the sun?

• the force of gravity
• the pull of the moon
• the tilt of Earth's axis
• the rotation of Earth

What is a clue that Earth is moving?

• You can feel Earth's movement.
• You are moving right along with Earth.
• The seasons change during the year.
• The stars move around Earth.

What affects the shape of a planet's orbit?

• asteroids
• comets
• the sun's light
• the sun's gravity

What do inner planets all have in common?

• They are small, rocky planets.

• They are made mostly of gases and liquids.

What is an eclipse?

• A circle stretched out in an opposite direction.
• Occurs when an object in space gets between the sun and another object and casts its shadow on the other object.
• Occurs when the moon passes between the sun and Earth and casts its shadow on Earth.
• Occurs when the moon passes through Earth's shadow.

What is a revolution?

• The movement of one object around another.
• The spinning of a planet, moon, or star around its axis.
• A small, frozen object that orbits the sun.
• A large, ball-shaped object that moves around a star.

What is a rotation?

• The movement of one object around another.
• Occurs when an object in space gets between the sun and another object and casts its shadow on the other object.
• The spinning of a planet, moon, or star around its axis.
• Occurs when the moon passes through Earth's surface.

What is a solar eclipse?

• Occurs when the moon passes through Earth's shadow.

• Occurs when an object in space gets between the sun and another object and casts its shadow on the other object.

• Occurs when the moon passes between the sun and Earth and casts its shadow on Earth.

• A small, frozen object that orbits the sun.

What is a lunar eclipse?

• Occurs when the moon passes through Earth's shadow.

• Occurs when an object in space gets between the sun and another object and casts its shadow on the other object.

• Occurs when the moon passes between the sun and Earth and casts its shadow on Earth.

• The sun, the planets and their moons, and other objects.