Which of the following is most important in causing a cloud of gas to collapse to form a star and planets?

A) Gravity pulls all the gas inward.
B) Pressure from other gas clouds pushes the gas inward.
C) Opposite charges in the gas attract.
D) Some gas is sent outward, causing the rest to move inward to conserve momentum.
E) Pressure from light from nearby stars pushes the gas inward.


A) Gravity pulls all the gas inward.

Physics & Space Science

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