Galaxies

In the 1920's and American astronomer, ​ (a)   discovered patches of light were ​ (b)   , made up of millions or billions of stars.

It is estimated that there are over ​ (c)   galaxies in the universe.

Galaxies are classified according to their ​ (d)   .

• Edwin Hubble
• galaxies
• 100 billion
• shape

Tags

NGSS.MS-ESS1-2

What is used by astronomers to classify galaxies based on their visual appearance

• Hubble tuning fork

• International space station

• Space X

• Apolla 13

Tags

NGSS.MS-PS4-2

How are galaxies classified:

• Brightness

• Temperature

• Shape

• Revolution

Spiral galaxies are made up of a ​ (a)   or nucleus.

This central core or nucleus contains a ​ (b)   .

It has areas of stars resembling arms that form what looks like it is ​ (c)   .

• central core
• black hole
• spiraling

Tags

NGSS.MS-ESS1-2

​ (a)   galaxies also have a central core but there is a ​ (b)   that come out of the core and the arms only come from the ends of the bars.

• Barred spiral
• bar of stars

Tags

NGSS.MS-ESS1-2

​ (a)   have a central core but no ​ (b)   .

Elliptical is another name for ​ (c)   shape.

• Elliptical galaxies
• arms
• oval

Tags

NGSS.MS-ESS1-2

​ (a)   galaxies have ​ (b)   central core, no arms, and no ​ (c)   .

They tend to be ​ (d)   than spirals and ellipticals.

• Irregular
• no
• organized shape
• smaller

Tags

NGSS.MS-ESS1-2

To make it easier to distinguish between the galaxies:

Spiral galaxies look like the arms are ​ (a)   .

Barred spiral has arms spiraling but there is a ​ (b)   in the central core.

Elliptical galaxies form an ​ (c)   shape with no arms.

Irregular galaxies have ​ (d)   , they are irregular.

• spiraling
• bar
• oval
• no shape

Match the following

• Spiral galaxy

• 
• Irregular galaxy

• 
• Barred galaxy

• 
• Elliptical galaxy

• 

Tags

NGSS.MS-ESS1-2

Our solar system is located in the __________ galaxy.

• Andromeda galaxy

• Milky way galaxy

• Cartwheel galaxy

Tags

NGSS.MS-ESS1-2