(MUSIC)
JOAN CARTAN-HANSEN,

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

PHOBOS IS ABOUT 14 MILES ACROSS.

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

ZIPS AROUND THE PLANET THREE
TIMES A DAY.

DEIMOS IS SMALLER AT ONLY ABOUT
EIGHT MILES ACROSS.

IT OBITS MORE THAN 12 THOUSAND
MILES ABOUT THE SURFACE.

AND TAKES ABOUT 30 HOURS TO
TRAVEL AROUND MARS.

BOTH LOOK MORE LIKE ASTEROIDS.

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

CRATERS ON THEIR SURFACE.

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

ORBIT.

PHOBOS IS SLOWLY SPIRALING
INWARD TO THE SURFACE.

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

BREAK APART INTO A RING OF
RUBBLE.

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

IT WILL EVENTUALLY JUST FLOAT
OFF INTO SPACE.

FOR MORE INFORMATION ABOUT MARS,
CHECK OUT THE SCIENCE TREK

WEBSITE.

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