Science Homework Help
Science Homework Help. Discussion 10: The Different Types of Galaxies (Chapter 26)
Discussion 10: The Different Types of Galaxies (Chapter 26)
1717 unread replies.1717 replies.
This discussion is about galaxy classification — the topic is covered in Chapter 26 Section 26.2 and now you get a chance to do it for real. There will be about 1 hour or so of work you need to do before you can write your discussion post, so please plan accordingly.
Galaxy Zoo is a citizen science program, where non-specialists can contribute to real scientific research. Follow the instructions in the link below to find the Zooniverse website, create an account there, and then find the Galaxy Zoo project. There is information there to get you started.
Once you have done at least 50 classifications, come back to Canvas and post a screenshot showing the number of classifications you’ve done, and answer the following questions about what you did:
- How do the questions asked by the Galaxy Zoo system relate to the galaxy classification system illustrated by the Hubble tuning fork diagram (refer to the powerpoint lecture or the text if you need a quick refresher). 3 points
- What kinds of galaxies are the most common in Galaxy Zoo? 3 points
And of course don’t forget to respond to 2 classmates’ posts for 2 points each.
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ReplyReply to Discussion 10: The Different Types of Galaxies (Chapter 26)
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Collapse SubdiscussionSophia Rivas Sophia Rivas
1. The questions asked on here were whether the galaxy looked smooth or not and in the tuning fork diagram those would be classified as the elliptical galaxies. It also asked if there are features or disks and in the diagram that would be for the spiral galaxies. On the tuning diagram he has them separated by how many spiral arms there are in the galaxy or whether or not the bar is visible. If so, the questions asked were if the bar is weak, strong, or no bar.2. I thought the most common galaxy shown was irregular and elliptical.
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Alexyah Duran Alexyah Duran (She/Her/Hers)
Hi Sophia,The questions on galaxy zoo seem to further break down the galaxies and in my opinion, helped show that these galaxies are somewhat different. I although had mostly ellipticals that were somewhat hard to see. I also had a couple of spirals that weren’t the clearest but I had one with no bar and one with a weak bar. It was really interesting to have seen the different examples of galaxies even though the universe is primarily filled with elliptical galaxies (that we have seen so far). I liked how they showed examples in the help section because even if you didn’t get those examples it was fun to see what else is out there,
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Kelly Machado Kelly Machado
Hi Sophia,I would say I saw more spiral or irregular and a lot of stars or artifacts. I agree that the questions were easy to answer. I do wish the website would tell you if the classification was correct or not.
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Nicole Bishop Nicole Bishop
Hi Sophia,Not sure if you had this too, but it seemed like a lot of the images I was given were strikingly similar and I wasn’t able to classify as many ‘rare’ galaxies and stars/artifacts. This was a little disappointing to me because I think it would have been cool to see a larger variety of pictures. Although, the overall classification activity was very helpful for me and I hope you gained something from it as well!
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Collapse SubdiscussionAlexyah Duran Alexyah Duran (She/Her/Hers)
1. The first question in classification has three options: smooth, features (or disk), and star (or artifact). In the Hubble fork diagram I would’ve just thought a star artifact would’ve been featured or disk since the fork makes it seem like they are similar. The question I thought relates to the Hubble diagram was, Is the galaxy merging or disturbed? The fork diagram doesn’t talk about it but we can visually see (it was pretty tricky for some) if there is a disturbance. The other question was, Do you see any of these rare features? I thought this again was interesting since we can see some of these differences in the Hubble fork diagram (although I didn’t get many examples of them).2. The galaxies I found that were most common on galaxy zoo were the elliptical galaxies.
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Peter Bauer Peter Bauer
Hey Alexyah, I had some trouble quantifying the “rare features” that the Zooniverse classification system had as well. I actually kind of liked it because it further divided galaxies up by somewhat unique traits, something that the Tuning Fork definitely doesn’t account for. Unfortunately I was not lucky enough to get a galaxy with one of those obvious “rare features” save for a couple with minor disturbances.
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Sophia Rivas Sophia Rivas
Hi Alexyah!I felt the same about the rare features because I was not sure what I was looking at for some of them it was defiantly difficult to distinguish. I also thought that the common galaxies on there were elliptical ones, I was excited when a spiral one came up.
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Collapse SubdiscussionPeter Bauer Peter Bauer
(Not sure why, but my classification number will not go past 45, I’ve tried doing way more, but the number stays the same, anyone let me know if you had similar issues). 1. The biggest difference between the Zooniverse classification system and the Tuning Fork is that the Fork considers galaxies to be elliptical as per their classification name and uses varying degrees of how spherical a galaxy is (E0-E7). Zooniverse describes them as “smooth galaxies” which is then further divided into circular, in-between, and cigar shaped. When it came to spiral galaxies, Zooniverse was a bit more specific than the Tuning Fork, which I found particularly helpful. If you got lucky enough to get a spiral galaxy with its spirals showing (I got about three of them), you could classify them based off how tightly wound the arms were and how many arms were present. 2. The most common galaxies by far for me were elliptical galaxies with no prominent bulge in the center.
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Alexyah Duran Alexyah Duran (She/Her/Hers)
Hey Peter,I had a similar issue although I got to 51 I had done way more and it wasn’t adding them to my score. I tried reloading the page but it wasn’t working so I just posted the score I had. I had the same type of ellipticals that were the most common. I had one or two spirals which were really interesting to see the arms. I agree that the galaxy zoo was more specific and broke down each question further. Although I was lost at first I did appreciate that they provided help and examples of the different features to help better my understanding of what I was looking at. Edited by Alexyah Duran on Jul 2 at 12:56pm
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Binh Nguyen Binh Nguyen
HI Peter,I don’t know why your classification is not past 45, you can refresh your page, log out and sign in again. It may be work. I have the same idea as you about the Galaxy Zoo system. It is more detailed than the Tuning Fork system. It makes us understanding clearly the galaxy system. It also divided bar features: no bar, weak bar, and strong bar. This system helps us to know the shape of the galaxy’s center.
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Collapse SubdiscussionBinh Nguyen Binh Nguyen
- The question about Galaxy classification on Galaxy Zoo system based on Hubble tuning fork diagram but more detail on each of the Galaxy. We can easily figure out the shape of the galaxy like smooth, disk or features, and star or artifact. On each of the questions that we choose, we can see more detail about the stars to understand and clarify what we learn. We do not need to have deep knowledge to understand and select. Each person has a specific idea and different view about the shape of the galaxy. I think the question system on the Galaxy Zoo want to know about general view from us to statistic and support to science.
- The most common in Galaxy Zoo when I classify is elliptical Galaxy.
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Sophia Rivas Sophia Rivas
Hi Binh! I agree about not needing to have deep knowledge to select a choice, and of course everyone has their own interpretation of what they are seeing and that’s okay too!
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Kelly Machado Kelly Machado
Hi Binh,When I was classifying I saw more stars or artifacts. I do wish the system would let you know if you classified the picture correctly. I like how you said it’s easy to use and understand what you are classifying.
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Collapse SubdiscussionKelly Machado Kelly Machado
1. The three basic galaxies asked/shown in Galaxy zoo are spiral, elliptical, and irregular. I really feel like Galaxy zoo did a great job providing pictures and asking descriptive questions about the pictures shown. My favorite feature about this website was the dark mode, but I didn’t like how it wouldn’t tell you if you described it right.2. Not only does galaxy zoo include the common three galaxies that I mentioned in #1 it also includes asking questions like is it a star or artifact, does it have a central bulge, and is there any disturbance.
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Nicole Bishop Nicole Bishop
Hi Kelly!I also found this website to do a really good job of providing quality photos that we could classify to help strengthen our knowledge. In my opinion, practicing this way has helped me better understand the differences between the galaxies and their different characteristics. Like you said, I also didn’t like how we are never told if we classified the galaxy correct or not. All in all, good job!
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Collapse SubdiscussionNicole Bishop Nicole Bishop
In this activity, to classify the galaxies, we are asked if looks smooth, has features or a disk, or if it appears to be a star or an artifact. Then from there, there is more classifications depending on what it has been classified as, such as the shape, strong or weak bars, and even if the galaxy is merging or disturbed. This was very similar to Hubble’s classification system, however, Galaxy Zoo referred to the galaxies as smooth, and Hubble’s diagram typically calls it “Elliptical. Throughout the simulation, I found the moth common galaxy to be smooth galaxies that I was seeing.
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Binh Nguyen Binh Nguyen
Hi Nicole;I also see the most common galaxy in the Galaxy zoo system is the smooth galaxy. This system is the same as Hubble’s clarification system. However, I think it is more detailed for us to clarify and understand.
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