<p>Stars can be plotted on an HR diagram, on which a main sequence is apparent, and stellar evolution can be plotted on on such a diagram as a function of mass. Is there an analog for galactic evolution? Are there "main sequence galaxies"?</p>

CC BY-SA 4.0
2020-01-28T15:59:49.433Z
For you, what would qualify as a "main sequence" - that is, what properties would a "main sequence galaxy" have? The term has been applied to galaxies with a particular relation between star formation rate and stellar mass, and I'd written an answer noting that, but I'm not entirely sure that it's what you're looking for.
HDE 226868
CC BY-SA 4.0
2021-05-28T00:46:58.617Z
[Early-type galaxies obey a narrow relation traced by their stellar content between the mass and size (Mass- Radius relation).](https://www.google.com/search?channel=fs&client=ubuntu&q=early+galaxies+mass+radius)
Keith McClary
<galaxy><stellar-evolution><main-sequence><hr-diagram><galactic-evolution>
Is there a galactic main sequence?
usernumber
# Is there a galactic main sequence?

(Asked by: username_0 on 2020-01-28)

Stars can be plotted on an HR diagram, on which a main sequence is apparent, and stellar evolution can be plotted on on such a diagram as a function of mass. Is there an analog for galactic evolution? Are there "main sequence galaxies"?

**Tags:** galaxy, stellar-evolution, main-sequence, hr-diagram, galactic-evolution

> **Comments:**
> **username_1**: For you, what would qualify as a "main sequence" - that is, what properties would a "main sequence galaxy" have? The term has been applied to galaxies with a particular relation between star formation rate and stellar mass, and I'd written an answer noting that, but I'm not entirely sure that it's what you're looking for.  
> **username_2**: [Early-type galaxies obey a narrow relation traced by their stellar content between the mass and size (Mass- Radius relation).](https://www.google.com/search?channel=fs&client=ubuntu&q=early+galaxies+mass+radius)  

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## 0 answers

