What evidence suggests that water once flowed on Mars?

• Canyons and volcanoes

• Ice caps and ancient river remnants

• Red soil

• Sand dunes

How does the size of Mars compare to Earth?

• It is the same size

• It is double the size

• It is half the size

• It is one fourth the size

What is the gravity of Mars compared to Earth?

• 38%

• 50%

• 75%

• 10%

How many moons does Mars have?

• One

• Two

• Three

• Four

Which moon of Mars is getting closer and might eventually crash into the planet?

• Deimos

• Europa

• Ganymede

• Phobos

What year were the first pictures of Mars taken by a satellite?

• 1955

• 1965

• 1975

• 1985

How many landers sent to Mars were successful?

• 3

• 8

• 21

• 5

How long does it take to travel to Mars?

• 3 to 6 months

• 6 to 9 months

• 9 to 12 months

• 12 to 15 months

How often does the launch window for Mars occur?

• Every 12 months

• Every 18 months

• Every 24 months

• Every 26 months

For how long is communication with Mars limited when the Sun is directly between the two planets?

• 24 hours

• 36 hours

• 48 hours

• 72 hours