The protostellar disk formed after the collapse of the solar nebula. What does the word "proto" mean?

A/An ____ is the path that a body follows as it travels around another body in space.

There is one point where the object is farthest from the sun. We call it ____

At which point does a planet move most slowly in its orbit, at aphelion or perihelion?

Is a force of attraction between objects that is due to their masses and the distances between them.

The inward force that causes an object to move in a circular path is called _____.

The point where the object is closest to the sun.

Who formulated the law of universal gravitation?

Planets that formed in the outer disk have rocky or metallic cores and deep atmospheres of gas and ice are called _______

The _______ disk was the disk in which the planets formed.

Inner planets which was made from the collision of rocks and metals are called _____.