Page 199 - (DK) I Can’t Believe It! 2

IT CAN’T BE TRUE! 197

FAST FACTS
400 Weight varies on other planets
because of the gravitational pull:
350
Weight comparable in numbers of house bricks 300 you weigh. This chart compares
the stronger the pull, the more
the weight of a 70-lb (32-kg)
250
child in house bricks. On Earth
200
he would weigh 14 bricks, but
on the Sun he would weigh
150
100
survive there).
50 28 times as much (if he could If everyone on Earth jumped at the
same time, the force would move our
0 planet the slightest amount— /100 of
1
Earth Moon Sun Mercury Venus Mars Jupiter Saturn Uranus Neptune the width of a hydrogen atom—before
moving back to where it was!
FLOATING FREE
You can An orbiting spacecraft falls toward
jump higher Earth, pulled by gravity. It also has a
on the Moon than horizontal speed, so it ends up circling
on any planet Earth. Because no force opposes the
in the solar falling, astronauts on board the craft
system. feel weightless and seem to float.

Uranus is larger but less
On supersized planet dense than Earth, with
Jupiter, gravity is more only 86 percent of our
than twice that of Earth, planet’s surface gravity.
pulling you back down Saturn’s gravity
after only a small jump. is only slightly
more than that
on Earth, so the
jumping height
is about the same.

MARS JUPITER SATURN URANUS NEPTUNE
31½ inches 4¾ inches 11 inches 13½ inches 10½ inches
(79.8 cm) (11.9 cm) (28 cm) (33.7 cm) (26.3 cm)

US_196-197_309600_Moon-Jump.indd 197 19/12/17 2:37 pm