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(MUSIC) 
JOAN CARTAN-HANSEN,

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HOST: MARS HAS NOT ONE BUT TWO 
MOONS: PHOBOS AND DEIMOS.

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PHOBOS IS ABOUT 14 MILES ACROSS.

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IT ORBITS ONLY 37 HUNDRED MILES 
ABOVE THE SURFACE OF MARS AND

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ZIPS AROUND THE PLANET THREE 
TIMES A DAY.

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DEIMOS IS SMALLER AT ONLY ABOUT 
EIGHT MILES ACROSS.

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IT OBITS MORE THAN 12 THOUSAND 
MILES ABOUT THE SURFACE.

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AND TAKES ABOUT 30 HOURS TO 
TRAVEL AROUND MARS.

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BOTH LOOK MORE LIKE ASTEROIDS.

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THEY'RE SHAPED KIND OF LIKE 
LUMPY POTATOES AND HAVE LOTS OF

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CRATERS ON THEIR SURFACE.

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AND UNLIKE OUR MOON, THE MOONS 
AROUND MARS ARE NOT IN A STABLE

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ORBIT.

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PHOBOS IS SLOWLY SPIRALING 
INWARD TO THE SURFACE.

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SO WITHIN 50 MILLION YEARS, IT 
WILL EITHER COLLIDE WITH MARS OR

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BREAK APART INTO A RING OF 
RUBBLE.

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DEIMOS, ON THE OTHER HAND, IS 
SLOWLY DRIFTING AWAY FROM MARS.

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IT WILL EVENTUALLY JUST FLOAT 
OFF INTO SPACE.

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FOR MORE INFORMATION ABOUT MARS, 
CHECK OUT THE SCIENCE TREK

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WEBSITE.

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YOU'LL FIND IT AT 
IDAHOPTV.ORG/SCIENCE TREK