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. "
About one-fourth as big
About half as big
About the same size
About twice as big
A little more than 12 hours
A little more than 24 hours
A little more than 48 hours
The Martian day never ends
178 Earth days
365 Earth days
687 Earth days
942 Earth days
Oxygen
Nitrogen
Methane
Carbon dioxide
4 miles high
10 miles high
16 miles high
120 miles high
One minute
Six minutes
One hour
Two hours
None
One
Two
12
199 degrees
64 degrees
64 degrees below zero
199 degrees below zero
10 pounds
38 pounds
50 pounds
100 pounds
Atmosphere
Radiation
Neither of the above
Both of the above