Which of the following groups are all terrestrial planets?

• Venus, Mars, Mercury
• Mars, Venus, Saturn
• Jupiter, Mars, Neptune
• Mercury, Saturn, Jupiter

What protects life on Earth from harmful ultra violet rays?

• Earth's distance from the Sun
• Earth's tilt
• Moon's gravity
• Ozone layer

Life on Earth would not be possible without which of the following?

• A moon & liquid water
• A moon and Earth's location
• Ozone and a moon
• Water & Earth's location from the Sun

Within our own solar system, the most likely candidate for having life on it is:

• Our moon
• Europa ( a moon of Jupiter)
• Mercury
• Saturn

Which two objects would have more gravitational forces acting between them?

• Earth & the Moon
• You and the Sun
• Sun and the Earth
• You and the Moon

Why would you weigh more on Jupiter than you do on Earth?

• Jupiter has more mass and more gravitational pull
• Jupiter has less mass and less gravitational pull
• You would not weigh more on Jupiter
• Jupiter has more mass and less gravitational pull

Even though orbits are ellipses, what shape is a typical planet's orbit most like?

• A short rectangle
• An egg-shape with a pointy end
• A long, narrow oval
• A circle

How does the gravitational force between the Sun and the planet change as they get farther apart?

•  Increases
• Stays the same
• Decreases
• No gravitational force

Which of the following groups of planets are all gas giants?

• Neptune, Saturn, Jupiter
• Venus, Mars, Saturn
• Mars, Venus, Mercury
• Mars, Jupiter, Neptune

Many of the Moon's craters formed when:

• Volcanoes erupted
• Seas evaporated
• The Sun partly melted the surface
• Space objects hit the Moon's surface