Which of the following best illustrates the role that gravity played in the formation of the solar system?
a. gravity allowed the nebula to expand and move outward.
b. gravity caused the nebula to cool enough for planets to form.
c. gravity removed excess gas and dust from the cores of the planets.
d. gravity pulled particles of dust and gas together to form planets.

Answer;

D. Gravity pulled particles of dust and gas together to form planets.

Explanation;The formation of the solar system took place about 4.6 billion years ago when gravity pulled together low-density cloud of interstellar gas and dust. In other words gravity pulled dust and gas particles together to form planets.It is believed that the solar system formed from an explosion that caused a disturbance of cloud of gas and dust in space. The explosion formed waves that squeezed the cloud and dust particles. Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula and then planets were formed.Gravity is important as It keeps the solar system together because without it the planets including the earth would be floating around.

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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