Time dilation

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My brain just followed you up to "we get older" and I understood, and thought to myself, "I am incorrect" but then "(it does)" sent my mind flying backwards trying to understand what on earth you mean?!

Sorry. I meant that you were right when you said that time seems to go quicker as you get older, but that has nothing to do with time dilation in physics.

Thank you for saying it more simply~♥ (:
And I understand~♥

Nothing like pictures to show the Doppler effect.







The sound got a speed of about 341m/s (If I remenber correctly).

Imagine you're in car going to 50mph, from the car you on the side you launch a little motrised skateboard going to 60mph. If you launch it to go in the same direction as your car it will slowly overtake you and slowly going away at the front as it go a little bit faster. If you lauch at the direction of the rear though, it will quickly disappear as it go speedilly in the other direction.
That's also how sound work, now look at the pictures and it may make sense.




The thing to keep in mind with relativity is that there is no absolute speed except for the speed of light, which mean either something is moving or not is only a question of point of view.



From the clock point of view the clock is see as immobile, but from the outside the clock is seen as moving. As you can see from th clock the light seem to travel a shorter distance, thus it should be going slower right? No it can't, as the speed of light is constant; which is allowed by the time on the clock going slower for those who observe it as moving. (So the light go at the same speed for both the clock and those who observe it moving, as speed is a measure of distance over time. )

We don't notice it in everyday life because light go ridiculously fast, so the effects are too small to be noticable by our senses. You would need some kind of super speed to notice it.

Don't know if I made myself clear...

all_white, you are not alone. I am just as hopeless and clueless as you are when it comes to this stuff.

Pictures won't help in my case. It's comprehensive logical step by step lectures and tutorials that help.

I thought the same, hey MCalavera, PM? (:

The choices of stars, though, are misleading. The redshift of the light isn't visible to the naked eye - Arcturus looks reddish because it's a K-type orange giant star, while Sirius is a binary star, consisting of one A-type blue giant star and one white dwarf companion. (Interestingly, some ancient Greek texts describe Sirius as being reddish, due in part to the fact that Sirius B used to be an M-class red giant star, which has since collapsed as a white dwarf. It is theorized that the red giant was artificially "aged" by infalling radiation from its blue giant companion.)

Arcturus also shows a variability in its redshift, leading some astrophysicists to hypothesize that the star hosts a planetary system. This was once a controversial claim; however, the recent discovery of a host of exoplanets makes this explanation seem more likely.

(Astrophysics is kind of a hobby of mine...)

Why not? Go ahead.

Yay!

Yes, you did. Thank you very much for your kind help. But that wasn't what my question was.



No one is answering my question!

Never mind. I think I know the answer by now.

Travel at the speed of light? This is your question?
What were we all talking about here then? o.o
No one really didn't answer her question

Well, no, actually, I got it wrong, EgyptianCat. It should have read "at 99.99% of the speed of light."

I typed it carelessly yesterday because I was in a hurry to get my answer. You might think it wouldn't really matter, but to all these clever scientists on here, that 0.1% makes a HUGE difference.

Technically, there's allegedly a speed limit in the Universe!

o.o
You sound smart~♥ o.o

No, I'm not! Really!

I didn't know any of this until yesterday, when I googled it for a specific reason.

I still cannot grasp time dialtion, but I understand about the Doppler effect on both light rays and sound rays. However, my question is: would a moving object appearing to be blue (due to Doppler blueshift) be visible to the naked eye, and has any such blueshift ever been caught on a specialised camera of any kind? Also, what colour would the blue be? Would it be a sort of flourescent blue?

I have found a photo of a galaxy exhibiting Doppler blueshift, but can someone please answer me without sidetracking to stars? I know moving objects can be stars, but I am not referring to stars and galaxies. I have a very specific thing in mind: an object travelling very, very fast through the air, down here on earth.

Thank you!

The following link answers some of my queries, but not all of them.

http://uk.answers.yahoo.com/question/in ... 129AATbgCL

I'm too tired to read all of that x_x
I'll read it tomorrow or my head will just be like, "394, 38x, =times 3 x y" and then turn off~♥
(I have no idea what I am saying)

You would have a hard time actually seeing with an organic human eye a Doppler shift color change. but with instruments Doppler shifts are seen every where. Particularly the shift of lines in a spectrum.

ruveyn