Space physics

What force keeps the planets in orbit around the Sun?

• Magnetism

• Friction

• Gravity

• Nuclear force

Why do astronauts feel weightless in space?

• There is no gravity in space

• They are in constant free fall

• They wear anti-gravity suits

• Space pushes them upward

What is a light-year a measure of?

• Time

• Speed

• Distance

• Brightness

What is the primary component of the Sun?

• Carbon

• Hydrogen

• Helium

• Oxygen

How long does it take for light from the Sun to reach Earth?

• 1 week

• 24 hours

• 1 hour

• 8 minutes

What phenomenon causes the seasons on Earth?

• The shape of the Earth

• The distance from the Sun

• The rotation of the Earth

• The tilt of Earth's axis

What is the main reason for the phases of the Moon?

• The Earth's shadow

• The Moon's rotation

• The Moon's orbit around Earth

• The Sun's position

Which planet is known as the Red Planet?

• Jupiter

• Earth

• Venus

• Mars

Which gas is most abundant in the Earth's atmosphere?

• Carbon Dioxide

• Nitrogen

• Oxygen

• Argon

What is the main source of energy for the Earth?

• Geothermal energy

• The Moon

• Wind

• The Sun