A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "Meteor" refers to the flash of light caused by the debris, not the debris itself.
If any part of a meteoroid survives the fall through the atmosphere and lands on Earth, it is called a meteorite.
Option A overweight
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The answer would be "the vector sum of forces acting on a particle or body."
Hope that helped ^^
Answer:
the motion of an object in a circular path , in a fixed orbit
12-15 billion years i think