Classifying Galaxies
 

Projetos do DR7
 Básicos
 Avançados
     - Diagrama de Hubble
     - Cor
     - Tipos Espectrais
     - Diagrama H-R
     - Galáxias
     - Mapeamentos do Céu
     - Quasares
     - Processamento de Imagem
 Desafios
 Para Crianças
 Jogos e Competições
 Links para Outros
Galaxies
 Classifying
 Hubble Tuning Fork
 Characteristics
 Clusters
 Separating
 Spectra
 Collisions
 Conclusion
 Your Results

Classifying Galaxies

Pretend that you are an astronomer working shortly after Edwin Hubble made his startling discovery. Now that you know the "nebulae" are actually other galaxies like our own, you must come up with a way to classify the galaxies.

Exercise 1: Look at the following galaxies. Divide them into groups based on features they have in common. There is no set number of groups.

Click one of the links in the table below to use the Get Fields tool to look up each galaxy. You will see a picture of the field the galaxy is in. Because galaxies tend to cluster together, some of the fields have more than one large and interesting galaxy. In all the other frames, the largest galaxy should be obvious. When you click another link, the new field will appear in the same window. You may want to print the fields out, so you can compare the galaxies side-by-side.

Run

Camcol

Field

752

1

244

2662

4

243

752

1

331

1737

6

11

756

4

198

2738

2

196

752

1

432

3325

3

319

3325

2

216

3325

2

215 (just left of center)

3325

3

230 (2 galaxies)

2738

3

122 (2 nice galaxies)

3325

3

352

3325

1

356

3325

1

359

Now, find another group and partner up with them to compare your results.

Question 1: Do you have the same number of galaxy classes? If not, what distinctions did one group draw that the other did not?

Question 2: What do your classification systems have in common? What makes them different?

Question 3: Try to combine the best features of each classification system. Repeat Exercise 1 with your new system.