Ch. IV Review

Front

What two factors affect the force of gravity between objects?

Back

Mass and distance.

Front

What significant observation did Edwin Hubble make about galaxies?

Back

The farther away a galaxy is, the faster it moves, providing support for the Big Bang Theory.

Front

What is a system of objects that revolve around a star called?

Back

Solar System.

Front

What process occurs in stars that creates the energy they emit?

Back

Fusion.

Front

How can the expansion of the universe be modeled?

Back

Use balloons laid on the floor to represent galaxies, then increase the space between the balloons to show how space is expanding.

Front

What is the relationship between mass and gravity?

Back

The greater the mass of an object, the stronger the gravitational force it exerts.

Front

How does distance affect gravitational force?

Back

The greater the distance between two objects, the weaker the gravitational force between them.

Front

What is the Big Bang Theory?

Back

A scientific explanation for the origin of the universe, suggesting it began from a singularity and has been expanding ever since.

Front

What is the primary source of energy in stars?

Back

Nuclear fusion, where hydrogen atoms combine to form helium, releasing energy.

Front

What is the observable universe?

Back

The part of the universe that we can see and measure, limited by the speed of light and the age of the universe.