Planets Answers

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6

Which force helps keep Earth in orbit?

A
Earth’s gravity
B
the moon’s inertia
C
the Sun’s gravity
D
the Sun’s inertia
7

In a far-off galaxy, an astronomer observes a moon orbiting a planet. The moon stays in orbit because of the planet’s gravity.Which scenario would increase the gravity of the planet?

A
decreasing the distance between the moon and the planet
B
increasing the distance between the moon and planet
C
increasing the planet’s inertia
D
increasing the moon’s inertia
10

Fredo’s spaceship takes him to the very edge of known space. There, gravity has no effect at all. Fredo takes a baseball and tosses it into space. What will most likely happen to the ball?

A
It will not move at all.
B
It will return to Fredo’s spaceship.
C
It will eventually stop moving.
D
It will continue moving in a straight line.
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