Question

Can I ask a astronomy question here? It's about classifying galaxies. Out of ten problems, my teacher said that I got seven right.. I'm uploading the pictures that he said I got wrong..

Answer 1

For that first one with Galaxy #2.

To which category does galaxy #2 belong? Why does it belong in this category?
Galaxy #2 belongs in the barred spiral category, because it has all of the characteristics of a normal spiral galaxy, but it also has bar of bright gas across the center of its bulge.

Answer 2

To which category does galaxy #4 belong? Why does it belong in this category?

Answer 3

Galaxy #4 definitely belongs in the irregular category, because there are no normal features to speak of in the galaxy, meaning it is probably the result of a collision.

Answer 4

To which category does galaxy #8 belong? Why does it belong in this category?

Answer 5

Galaxy #8 belongs in the in the spiral category because of its curving arms and flattened disk.

Answer 6

Here are the instructions:
Types of Galaxies
For this project, you will classify galaxies into one of four categories—elliptical, irregular, spiral, or barred spiral. The categories can be described as follows:

Elliptical galaxy—A galaxy whose stars are symmetrically dispersed in a spherical or elongated shape.

Irregular galaxy—A galaxy formed by the collision of other galaxies.

Spiral galaxy—A galaxy with a central bulge, flattened disk, and curving arms.

Barred spiral galaxy—A spiral galaxy with a bar of bright gas across the center of the bulge.

Directions
Below are pictures of ten galaxies, each followed by a text box. Using the text box, you will categorize each galaxy and explain why you chose the category. If you are uncertain about how to categorize a galaxy, explain why it was difficult to pick among the categories. In explaining your choices, you should refer to the descriptions of the galaxies above.