7.3 - Types of Galaxies

Front

What is an irregular galaxy?

Back

A type of galaxy that lacks a well-defined shape and structure.

Front

What is the evidence that supports theories of galaxy formation?

Back

Observations of cosmic microwave background radiation.

Front

What is the primary factor in galaxy formation?

Back

Gravity.

Front

What is the largest structure in the universe?

Back

The universe itself.

Front

What is a characteristic of spiral galaxies?

Back

They have a flat, disk shape with spiral arms.

Front

What are the three main types of galaxies?

Back

Elliptical, spiral, and irregular.

Front

What is a characteristic of elliptical galaxies?

Back

They have an oval shape and lack spiral arms.

Front

What is a lenticular galaxy?

Back

A type of galaxy that has a central bulge and a disk but no spiral arms.

Front

How do galaxies form?

Back

Galaxies form from the gravitational attraction of gas and dust in space.

Front

What role does dark energy play in the universe?

Back

Dark energy is thought to be responsible for the accelerated expansion of the universe.