Galaxies Review

Front

What is a galaxy?

Back

A huge system of millions or billions of stars, together with gas and dust, held together by gravity.

Front

What are the three main types of galaxies?

Back

Spiral, Elliptical, and Irregular.

Front

Describe a spiral galaxy.

Back

A flat, disk-shaped galaxy with a central bulge and winding 'arms' that extend outward.

Front

What characterizes an elliptical galaxy?

Back

An elliptical galaxy has an oval shape and lacks the distinct arms found in spiral galaxies.

Front

What is an irregular galaxy?

Back

A galaxy that does not have a distinct regular shape, often appearing chaotic.

Front

What is the Milky Way?

Back

The Milky Way is the spiral galaxy that contains our solar system.

Front

How do galaxies form?

Back

Galaxies form from the gravitational attraction of matter in the universe, leading to the clumping of stars and gas.

Front

What role does gravity play in galaxies?

Back

Gravity holds galaxies together, keeping stars, gas, and dust bound within them.

Front

What is the difference between a galaxy and a solar system?

Back

A galaxy is a large system of stars, while a solar system consists of a star and the celestial bodies that orbit it.

Front

What is a nebula?

Back

A nebula is a giant cloud of gas and dust in space, often the birthplace of stars.