Question

Can you explain this to me?

Answer 1

Imagine pointing a telescope at a star, then filtering the incoming light by color. The amount of light of the specific color is then the 'intensity' in the graph and 'wavelength' corresponds to the color of the light.

Answer 2

Oki, but I still don't understand what're they asking, well I do but I don't know how to go about it. Yellow stars are brighter than red stars but I don't know exactly how to specify that.

Answer 3

Well, brighter = more total amount of light. The total amount of light is the light for all wavelengths combined, which in the graph corresponds to the area under the curves (the integral).

Answer 4

So that is one part, the other part of the answer to why the curves look different is simply because the stars have different colors. So we expect the peak intensity for the red star to occur in the red-wavelength part of the spectrum and in the yellow-wavelength part for the yellow star.

Answer 5

The peaks are therefore shifted. But your point of the yellow star being brighter is very good.

Answer 6

It just means that the total amount of light or "area under the curve" should be slightly more for the yellow star, which it looks to be.

Answer 7

I have a good concept but could you help me lay it out?

Answer 8

I'm sure you could explain it back to me if you read what I wrote one more time. You should answer why are the peaks at different places for the red and yellow star, and you can also add that the yellow star's curve has more area under it so it's brighter.

Answer 9

It could go something like this: "The graphs are different because the peak intensity for the red star is in the red part of the spectrum and the peak intensity for the yellow star in the yellow part of the spectrum. The yellow star is also brighter and thus has more area under its curve."

Answer 10

Ok, I get it. Ty!

Answer 11

Could you read over one of my answers and see if its correct?

Answer 12

Sure :)

Answer 13

Looks good. There is just a few small things that might need changing, like "distance between galaxies would continue to expand thus creating new galaxies". I'll just try to explain the answer simply, and you can change anything in your answer afterwards if you want to. But your answer is mostly correct.

Hubble's Law states that the further away a galaxy is from us, the faster it's flying away from us. If we were sitting far away in another galaxy we would see the same thing (galaxies further away speeds away faster). So this basically means of this is that space is stretching everywhere (exactly like the surface of a balloon being blown up), if we would look at this process in reverse, we would see that space would instead contract. All distances between everything shrinking until we reach a single point, the big bang. The red shift comes from the fact that when a galaxy shines light towards us, space literally stretches the light out as it moves towards us because all of space is expanding. So the wavelength has gotten longer when the light finally reaches us.

Answer 14

Oh thank you :p

Answer 15

I have to go, can you check some of my answers later?

Answer 16

Sure, just message me and I'll check em' later (maybe I do it tomorrow, I have to go to sleep soon.)