Star Systems and Types of Galaxies

We've learned a lot about stars! We know how they form, and we know that most of them exist in galaxies. But how are they arranged within galaxies? And are there different types of galaxies or are they all the same? There is a lot to discuss here, so let's expand our understanding of star systems and galaxy types!

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[DS-Pakaemon]

I don't study anything related to astronomy, but the way you explain it in simple terms that I cannot resist myself from watching it! Knowledge is power!

[michaelpisciarino]

0:40, 1:34 The First Stars are a.k.a. Population III Stars

1:58 Stars form Binary, Multi-Star System, and Star Clusters

2:50 Red Dwarfs are typically isolated

4:00 Galaxy Shapes and Sizes
4:58 (1) Spiral Galaxies. (2) Elliptical Galaxies are smooth. (3) Irregular Galaxies (S, E, IRR) 5:30
Sa= Super tight arms
Sd= Super Loose arms

6:52 *How do Galaxies Form?* 9:12
7:49 Gazing into The Past.
Quasars, brighter than entire galaxies

10:00 Galactic Collisions, Galactic Merging, Galactic Cannibalism

11:58 The Milky Way Galaxy

[nickyblosser]

I honestly would have expected this channel to be more popular

[anilchoubey]

I watched 3-4 videos of your channel and got surprised I didn't know about your channel. Your presentation is very clear and easy to understand; contents are very good. I didn’t expect such serious study material watching your title song… Thumbs up. Keep doing good things…

[drewmetra]

final astro exam in 2 days
i appreciate you so, so, so much.

also, probably a common comment but
seeing this much actual content/ useful knowledge in this much time casts a long shadow over my country's education system (or at least my uni, which is in the top three)

[burnmyuncle]

First, best education purposed channel ever

[theaviator]

This video made me wonder how we could possibly know what the Milky Way looks like if we could never get a picture of it from outside. And I found out, duh, looking at how our pictures from Earth always show some kind of band of stars, the galaxy has to be a disc! First time in a while I’ve had one of these humbling “well, turns out I’m stupid” moments 😂

[MominEnjoyer]

Kurzgesagt: Basics
Professor Dave Explains: Details
The perfect duo

[Sirmatthaeus]

Dave:explaining the formation of galaxies and stars
Me:i like your funy words magic man

[Kennychan]

i love your video dave..it helps me clear the concept of Astrophysics (the grad program i'm doing)..espcially cosmology, galaxy and stellar astronomy....your video is very funny but very informational....very engaging! well done!

[Killbayne]

The way you explain it simply, but not too simply is perfect for beginners like me.

[lavender-tea]

Professor dave, youre getting me through my astronomy exams. A million thanks, i would be so cooked without you😭

[qingyangzhang]

Space is so dynamic and interesting! Actually I am reading a book by Prof Joseph Silk, and he talks about galaxy formation. He says that scientists are still unsure about whether galaxy clusters formed first, then fragmenting into individual galaxies, OR individual galaxies gradually became bounded gravitationally to form clusters. Space is fascinating, especially when you try to think about how small the earth is compared to the observable universe.

[dileepawarnakulasooriya]

I could understand your lecture easily.Thank you Professor Dave

[Astro-Markus]

Two issues: When you look at the Initial Mass Function of stars in clusters, most of those stars are low-mass stars like red dwarfs. Therefore, any agglomeration of stars is dominated by low-mass stars, aren't they? So, saying that low-mass stars tend to be found in isolation may be misleading. The other thing is that I have learnt in university that spiral arms do not contain particularly many stars as opposed to the space between them. It is just that most of the bright massive stars are there and dominate the brightness distribution across the disk. Stars predominantly form in the dense ISM we find in the spiral arms. Therefore, short lived massive stars die shortly after leaving the spiral arms made of ISM.

[GalaxyGoldbox]

Milky Way: Large *Magenellic* Cloud be looking yummy.
LMC: plz no
Andromeda: *Milky Way be looking yummy.*
Milky Way: no
Andromeda: yes

[morsalmarvi]

Your lessons are mesmerizing, I really do enjoy your simple explanations, thanks alot

[planetearth]

Seeing this video (albeit somewhat late relative to its upload date) reminded me of an interesting sub-category of spiral galaxies dubbed super spirals. It's pretty much exactly how it sounds!

[cuteLLcubby]

This helps me with my astronomy class and it's explained so simply thank u 💗

[TheNeptuneArc]

Actually, there have been at least a couple of cases of galaxies hosting no supermassive black holes at their center. So "every large galaxy" doesn't have a SMBH at their center. Good job on the rest of the video!