Galaxies and Gravity Review

Front

The force of gravity acting on an object is the object's ______.

Back

weight

Front

As distance between two objects increases, the pull of gravity ______.

Back

Decreases

Front

An astronomical unit is...

Back

The average distance between the Earth and the Sun.

Front

What type of galaxy is characterized by spiral arms?

Back

Spiral

Front

Distance measurement used by astronomers for distant objects is called ______.

Back

Light Years

Front

What is the primary force that holds galaxies together?

Back

Gravity

Front

What is the shape of an elliptical galaxy?

Back

An elongated, oval shape.

Front

What is the main difference between a spiral galaxy and an elliptical galaxy?

Back

Spiral galaxies have arms and a flat disk, while elliptical galaxies are more rounded.

Front

What is the term for the center of a galaxy, often containing a supermassive black hole?

Back

Galactic nucleus.

Front

What is the approximate distance of one light year in kilometers?

Back

About 9.46 trillion kilometers.