10 Questions | Total Attempts: 5202  Settings  Mars, named after the god of war in Roman mythology, is one of the five planets well known to many of the world's ancient civilizations. Throughout history, it's been the subject of observation and speculation. But how much do you know about Earth's neighbor? This quiz just might teach you a thing or two about the "fourth rock from the Sun. "

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• 1.
How does Mars' diameter compare with Earth's?
• A.

• B.

• C.

• D.

• 2.
About how long is a Martian day?
• A.

A little more than 12 hours

• B.

A little more than 24 hours

• C.

A little more than 48 hours

• D.

The Martian day never ends

• 3.
In Earth terms, about how long is a Martian year?
• A.

178 Earth days

• B.

365 Earth days

• C.

687 Earth days

• D.

942 Earth days

• 4.
What is the dominant ingredient of the Martian atmosphere?
• A.

Oxygen

• B.

Nitrogen

• C.

Methane

• D.

Carbon dioxide

• 5.
How high is the highest point on Mars?
• A.

4 miles high

• B.

10 miles high

• C.

16 miles high

• D.

120 miles high

• 6.
If you were using radio signals to chat with a friend on Mars when the two planets were at their minimum distance from each other, about how long would the minimum gaps in the conversation be?
• A.

One minute

• B.

Six minutes

• C.

One hour

• D.

Two hours

• 7.
How many moons does Mars have?
• A.

None

• B.

One

• C.

Two

• D.

12

• 8.
What's the average surface temperature of Mars in Fahrenheit degrees?
• A.

199 degrees

• B.

64 degrees

• C.

64 degrees below zero

• D.

199 degrees below zero

• 9.
If you weighed 100 pounds on Earth, about how much would you weigh on Mars?
• A.

10 pounds

• B.

38 pounds

• C.

50 pounds

• D.

100 pounds

• 10.
Mars' surface environment would be deadly to animal life from Earth. Why?
• A.

Atmosphere

• B.