17-1 Hubble Galaxy Classification

What is the purpose of the Hubble tuning fork diagram?

• To classify different types of stars

• To group galaxies into major categories

• To measure the distance of galaxies

• To identify the age of galaxies

How do elliptical galaxies vary in their shape?

• Some are more triangular

• Some are more rectangular

• Some are rounder than others

• Some are more hexagonal

What is the main characteristic of galaxies mentioned in the text?

• They are all the same size

• They come in different shapes and sizes

• They are all circular

• They are all elliptical

What is the shape of some galaxies as mentioned in the text?

• Circular

• Triangular

• Hexagonal

• Pentagonal

What does the Hubble tuning fork diagram help to identify?

• The age of galaxies

• The type of galaxies

• The color of galaxies

• The temperature of galaxies

How are elliptical galaxies classified?

• Using letters from A to G

• Using numbers from 1 to 10

• Using an 'E' followed by a number from zero to seven

• Using colors

What is the shape of an E0 galaxy?

• Flat disk

• Spherical

• Spiral

• Irregular

What is a feature of spiral galaxies?

• No central bulge

• No star formation

• Spiral arms

• Only old stars

What is the main area for star formation in a spiral galaxy?

• The central bulge

• The disk

• The spiral arms

• The halo

What is the main composition of elliptical galaxies?

• Young stars

• Old stars

• Gas and dust

• Water