Question

ASTRONOMY! PLEASE HELP! Why is the halo of the galaxy the most important part of the galaxy?

Answer 1

probably better off in the Physics sector of this website.

Answer 2

yea I'm trying both

Answer 3

Is that all that the question asks you? no diagrams or anything?

Answer 4

Is this question about a specific galaxy, or galaxies in general?

Answer 5

it says..... An astronomer claims that the halo of a galaxy is the most important part of a galaxy, even thought it lacks many stars and doesnt have any gas clouds. Explain why the astronomer is making this claim. Then, pick either stars or gas clouds and explain how the halo links to that part of the galaxy.

Answer 6

its for my astronomy 101 class

Answer 7

@mathstudent55 its about galaxies in general

Answer 8

Perhaps it is because the Halo could be used to determine the relative age of the galaxy? Since the halo is just typically filled with old stars and globular clusters. No gas or dust. The young stars are usually towards the center of a galaxy, near the bulge.

Answer 9

yes that sounds kind of familiar.. my professor talks so fast that i never have time to process all his lectures
so...then the stars would be the link because they help us find the age

Answer 10

Or maybe its because we can see the orbital speeds of these old stars to see the effects that dark mater has on them? Since they are in the outer halo, their orbital velocity should be slower than they actually are.

Answer 11

i dont think we talked about orbital speeds haha

Answer 12

ok nevermind that lol

Answer 13

haha yea ok so thats good it hold old stars which helps us find the age.

Answer 14

i have two other questions on this assignment do you think you could help me on also?

Answer 15

I can try.

Answer 16

Thanks! ok so the next one is.... There are two main reasons that AGN happened more often in the past: one having to do with the locations of galaxies, and one having to do with the compositions of galaxies. Pick one reason and explain it.

Answer 17

By past i assume closer to the big bang. Have you learned about the expansion of the universe yet?

Answer 18

the only thing i have in my notes about AGN is that the center of the galaxy is the most active = Active galactic nuclei (centers)

Answer 19

Yes we were talking about it in class but i didn't understand it too well and yes i believe it means closer to the big band

Answer 20

Alright so im going to take a shot in the dark.

Answer 21

In the past, galaxies were much closer than the are now because of the expansion of the universe. When the universe was much younger, galaxies were much closer and the temperature was much higher as well. Perhaps AGN were much active in the past because the density and temperature of the universe caused these galaxies to emit large amounts of radiation from their galactic nuclei.

Answer 22

Thats my best guess

Answer 23

That was very well said...thank you!!
ok let my type out the last question

Answer 24

The Fate of the Universe. A) What effect does dark matter have upon the Universe and what effect does dark energy have upon the Universe? B) Which, dark matter or dark energy, wins and what is the fate of the Universe?

Answer 25

Damn lol

Answer 26

yea.... i know

Answer 27

in my notes i put a star by the world will end in ice because he was saying that it is more likely to end in a big chill....rather then doing the reverse big bang, a "big crunch"

Answer 28

because you need like a total of 1 amount of stuff to have a big crunch and there is 0.05 atoms and 0.26 dark matter

Answer 29

Dark matter is just not "regular" matter. By "regular" matter, i mean matter that is composed of protons, neutrons, and electrons. Dark matter essentially just adds more matter than we expected. like i said earlier with the speed of stars towards the outer halo of a galaxy, they should be slower, but they are actually father than they should be. Dark energy ACCELERATES the expansion of the universe, the universe is not expanding at a constant velocity.

Answer 30

faster*

Answer 31

so then dark energy is the one that wins and keeps expanding the universe leading us to a "Big Chill"

Answer 32

right?

Answer 33

Also, Dark energy is, in some cases, strong enough to overcome the effects of gravity. Pushing galaxies away from each other. As for who wins? no idea, i would say dark energy. But thats just a guess.

Answer 34

Ok great. Thanks a bunch! and I'm so sorry to do this but i have one more question which is like extra credit for the class so the prof hasn't talked about it at all and i have no idea haha

Answer 35

haha ok

Answer 36

it says to Describe the drake equation and the fermi paradox. then list five possible solutions to the fermi paradox. and of these five which do you think is most likely to be correct? why?

Answer 37

Alright so the drake equation is just an equation that estimates the number of active, advanced civilizations that can/are communicating. N = R* • fp • ne • fl • fi • fc • L

Answer 38

The fermi paradox asked the question of where are all the aliens? given the age of the universe relative to ourselves, we should have encountered some by now.

Answer 39

wow....this is some weird stuff haha

Answer 40

I know right!

Answer 41

hahah like who even thinks of this?? hahah

Answer 42

oh I found a site that has 6 solutions...can you let me know if they seem okay? https://medium.com/o-s/6-mind-bending-solutions-to-the-fermi-paradox-c0f32e47a0f7#.27qxr3n4k

Answer 43

haha, i googled it and i was looking at the same website as you sent it. They seem sensible.

Answer 44

hahah okay sound great! haha which seems the most correct to you? lol they all seem nuts to me

Answer 45

Has your professor explained Occams razor to you guys yet? It basically says that the simplest answer is the most correct. While this is not always true, its a pretty good chance. So whichever is the simplest i would say is the right one. You can just say, We are the first ones here, thats why we haven't encountered any aliens.

Answer 46

Yea i went over that in one of my other classes! haha

Answer 47

Thank you soooo muchhhh!!!! you literally saved my retricefrom failing! hahahah

Answer 48

No problem, it was my pleasure.

Answer 49

@royalranger hey are you switching over to brainly when open study shuts down?