Now, set the mass of both balls to be equal. Increase the distance between them by pulling one of the balls away from the other. To pull a ball away, click on the ball and drag it. What happens to the force arrows between the two balls? What does this mean in terms of gravity?

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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