Show:
Earth
Moon
Sun
Solar System
Other Information
100
What is the thin layer of gases that surround Earth?
atmosphere
100
How long does it take the moon to orbit Earth?
27.3 days
100
Why does it appear that the sun rises in the east and sets in the west?
direction of Earth's rotation
100
What is a star?
enormous spinning sphere of glowing gases that give off heat and light
100
What is the force that pulls all objects towards one another?
gravity
200
What causes seasons?
tilt of Earth on its axis
200
Does the moon produce its own light?
No, the Sun's light reflects off the moon's surface.
200
Why does the sun provide heat and light?
it is the largest object in the solar system
200
What is a satellite that orbits a planet called?
moon
200
What shape are elliptical galaxies?
oval or football shaped
300
What is weight?
the measure of the downward force of gravity on an object.
300
What causes moon phases?
the moon orbiting Earth
300
What is the sun?
star
300
What makes up the solar system?
sun and all of its satellites
300
What causes day and night on Earth?
Earth rotating on its axis
400
What is rotation? What does Earth's rotation cause?
Earth spinning on its axis; day and night
400
What causes craters on the moon? Why can we still see craters that formed long ago?
impacts of meteorites; moon doesn't change - shadows in the craters
400
What does the sun provide for living things on Earth?
Heat and light
400
What galaxy is Earth located in? What shape is it?
Milky Way; elliptical
400
What is the difference between gravity and weight?
gravity is the fore that attracts objects to one another; weight is the measure of the downward force of gravity on an object
500
What causes a year? How long is one Earth year?
the time it takes for a planet to revolve one around the sun; 365 days
500
What causes a new moon? What causes a full moon?
The moon is between the earth and sun so no light shines on it; the earth is between the sun and moon so full light shines on the moon.
500
What is the largest object in the Milky Way?
Sun
500
Name three ways that Earth is always moving?
tilting on axis, rotating on axis, and revolving around the sun
500
Do all planets have the same length of years? Explain.
No, planets closer to the sun travel around the sun faster