The Milky Way is Not a Spiral?

In summary, there is evidence that suggests the Milky Way is not a traditional spiral galaxy. Instead, it is classified as a barred spiral galaxy, which has a central bar-shaped structure with spiral arms extending from it. This conclusion is based on observations of the distribution of stars, gas, and dust in the Milky Way, as well as comparisons to other spiral galaxies. It is unlikely that the Milky Way will ever become a traditional spiral galaxy, as its structure is determined by its unique history and interactions with other galaxies. However, there are other galaxies with a similar barred spiral structure, such as the Andromeda and Triangulum galaxies.
  • #1
cscott
782
1
I thought this Slashdot story might be appropriate for here.
 
Astronomy news on Phys.org
  • #2
A barred spiral is still a spiral galaxy. The Hubble Type would be something like SBbc.
 
  • #3
You are correct. I only mimicked the Slashdot title. :smile:
 
  • #4
cscott said:
You are correct. I only mimicked the Slashdot title. :smile:

Oh, right. Silly slashdot. :biggrin:
 
  • #5
cscott said:
I thought this Slashdot story might be appropriate for here.

New Scientist has an article about Milky being a barred spiral
http://www.newscientist.com/article.ns?id=dn7854
 

1. What evidence supports the claim that the Milky Way is not a spiral?

There are several lines of evidence that suggest the Milky Way is not a spiral galaxy. One key piece of evidence is the distribution of stars in the Milky Way. Spiral galaxies have a distinct spiral shape, with most stars concentrated in the arms. However, the stars in the Milky Way are more evenly distributed, with no clear spiral structure. Additionally, observations of gas and dust in the Milky Way do not match the expected distribution for a spiral galaxy.

2. If the Milky Way is not a spiral, what type of galaxy is it?

The Milky Way is classified as a barred spiral galaxy. This means that it has a central bar-shaped structure with spiral arms extending from the ends of the bar. This type of galaxy is less common than traditional spiral galaxies, but still falls under the broader category of spiral galaxies.

3. How do we know the Milky Way is not a spiral if we are inside it?

Although we are located inside the Milky Way, scientists have been able to map the structure of our galaxy using various techniques. One method is to observe other spiral galaxies and compare them to the Milky Way. By studying the shapes and distributions of stars, gas, and dust in other galaxies, we can infer the structure of our own galaxy. Additionally, advanced telescopes and instruments have allowed us to create detailed 3D models of the Milky Way.

4. Are there any other galaxies like the Milky Way?

Yes, there are many other galaxies that have a similar structure to the Milky Way. As mentioned before, barred spiral galaxies are less common than traditional spiral galaxies, but they still make up a significant portion of the known galaxies in the universe. Some examples of barred spiral galaxies include the Andromeda Galaxy and the Triangulum Galaxy.

5. Could the Milky Way eventually become a spiral galaxy?

It is unlikely that the Milky Way will ever become a traditional spiral galaxy. The shape and structure of a galaxy are determined by its initial conditions and interactions with other galaxies. The Milky Way's barred spiral structure is likely a result of its unique history and interactions with other nearby galaxies. It is possible that the Milky Way could evolve into a different type of galaxy in the distant future, but it is unlikely to become a traditional spiral galaxy.

Similar threads

  • Astronomy and Astrophysics
Replies
2
Views
2K
  • Astronomy and Astrophysics
Replies
16
Views
1K
  • Astronomy and Astrophysics
Replies
0
Views
281
Replies
31
Views
3K
  • Astronomy and Astrophysics
Replies
3
Views
874
Replies
11
Views
2K
Replies
11
Views
1K
  • Astronomy and Astrophysics
Replies
4
Views
1K
Replies
6
Views
949
  • Astronomy and Astrophysics
Replies
2
Views
940
Back
Top