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The video shows a collapsing cloud of interstellar gas, which is held together by the mutual gravitational attraction of all the atoms and molecules that make up the cloud. as the cloud collapses, the overall force of gravity that draws the cloud inward because .

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skyluke89
The overall force of gravity becomes stronger and stronger. This is because the gravity depends on the inverse of the square of the distance:
[tex]F=G \frac{m_1 m_2}{r^2} [/tex]
and since the distance r between the molecules becomes smaller, the gravity increases more and more.

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