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You
can search for and then find all the words relating to life.
To
weigh other planets, we can observe how hard they pull on
their moons or on spacecraft we send to visit them. The
planet's weight determines how fast a moon moves as it
orbits the planet. So astronomers measure how far the moon
is from the planet and how long it takes to go around in its
orbit, and that allows them to weigh the planet.
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