Unit 2- Lesson #5- Using the Hubble Tuning Fork to Classify

Galaxies

SWBAT: 1. Use the hubble tuning fork to

classify galaxies.

WOD:

Initial Activity: Read the about seeing “The Milky Way from Earth” and describe how it is possible to take a picture or see the Milky Way from Earth. Cite details from the article to support your answer.

Mini Lesson: What is the Hubble tuning fork and how is it used to classify galaxies?

Activity: Classifying galaxies lab .

Summary: Why is the “tuning fork “ a good way of classifying the galaxies? Is there a better way?

Classifying GalaxiesUsing the Hubble Tuning Fork

Ellipticals- Sphereoidal, no disk• E0- roundest • E3- roundness decreases• E5- Starts to get more flat (egg

shape)• E7- flattest

Spirals-• S0- Looks elliptical but has a disc

shape• Sa- big bulge, tightly wound arms• Sb- medium wound arms• Sc- small bulge, loosely wound

arms Barred Spirals- have a distinct

line or bar that stretches out from the center, bulge in the center, and arms that spin out.

Classifying GalaxiesUsing the Hubble Tuning Fork

How to Classify:

Observe the picture of the galaxy and compare it to the two pictures provided for each type of galaxy in the EHCS.

Choose the one that best

matches and support how you knew using evidence from the picture and text.

Lets Try ItModel of how to observe a galaxy and

classify it using the Hubble tuning fork.

Now you tryCompare pictures A and B to the fork and decide their classification. Justify your response using details from the

picture, fork, and your notes.

A

B