What Is a Redshift?

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1. The Doppler shift applies strictly to motion within a medium, air, water or Earth. It has no function in the nothingness of space. If you believe that space itself is expanding and has been over the assigned time of the universes existence then we should have no galactic mass closer than two billion light year miles to our own. This is discounted by the fact that the Andromedia Galaxy is only about two point two million light years away and if we can believe astronomy is approaching us. The light coming from this galaxy is shifted into the red which implies that it should be moving away from us either in terms of expanding space or real motion. Given that, how can it possibly be on a collision course with the Milky Way Galaxy. The two conditions are incompatible.           
2. He talks to me like I'm less than 3 years old for asking this question
3. None of our school textbooks or teachers have explained redshift as easy and simple as this, thank you so much!!
4. GREAT explination, yet proves proof og big bang
5. OMG thanks sooo much i get it now! gcse exam tomorrow...oopsies :S THANKS
6. Howie47: the universe is expanding *globally*, meaning that most of galaxies move away from us, but it does not mean that all do. Fridays, most cars are moving away from big towns to countryside, it is like an "expansion" of cars, but it does not mean that *no car at all* moves toward the town at the same time.
7. Howie47: the universe is expanding *globally*. It means that not *all* galaxies are moving away from us, but most of them are. Compare that with people living in big towns moving to countryside on week-ends. It is like an "expansion" of cars. Fridays, most cars drive away from the town, but it does not mean that no car at all drives toward the town.
8. I see your point about blue shift. The astronomer failed to mention that blue shift has little or no relevance to the "expanding" universe. Blue shift is indeed observed when a star is in orbit around a central mass. During the period of orbit when it is coming closer to us, it appears blue and as it moves round the other side away from us, it appears red. Hope that made sense :/
9. A bunch of non-sense. The speaker doesn't even look convinced of what he is reciting. Why are some moving toward us? Kind of undermines the whole everything is expanding from a single point theory. These people love to make stuff up, so they can seem so intelligent. When their theories are disproved! They have no loose. It's on to the next.
10. Exactly. their logic is very fuzzy here. since it is moving away faster it's light is red. Which tells us it's moving faster. Not how far it is. Since some are moving toward us. The whole theory of the big bang is idiocy. Also this guys recital of the theory, and facial expressions, says he isn't even convinced.
11. omg thanks
12. thanks alot!!!
13. i have an exam 2morrow this is some really good explanation it really does help with the animation and stuff thx:)
14. thanks, this will help me study for my test!
15. What a nice man....
16. Space dont expanding. New model of an atom The atomcores expand three-dimentionally, opening up energywaves that have the nature of expanding electrons and expanding photons. expanding electrons and expanding photons emit also expanding energy... If you want some perspect for visible universe, take a look that video! Idea from Kuopio
17. The universe is expanding, superzealander is confusing the idea of a straight line as observed by us and that when considering space-time. Abstractly it is hard to imagine anything with more than 3 spacial directions. We have to consider space like a balloon, so a straight line drawn on a balloon would eventually come full circle back to the start, but if we expand the balloon it has further to travel, hence the red shifting.
18. The Universe may have been be expanding but the red shift can only tell us what direction those objects were moving at the time the light left them which in many cases is millions of years. No one know for sure. Superzealander that's quite a brilliant way of seeing it (the straight line thing), but I think you're jumping gun about redshift (I pretty sure the scientific community is unanimous on this one).
19. " It is concluded that either earth is indeed the center of the Universe or the cosmological redshift interpretation is not correct. " from THE RED-SHIFT HYPOTHESIS FOR QUASARS:. IS THE EARTH THE CENTER OF THE UNIVERSE ? II. Y. P. VARSHNI. Dept. of Physics, University of Ottawa, Ottawa, Canada ... ( + When and Where Did Motion First Start ? ) Finding the Center of the Universe is Easy. The Center of the Universe is where MOTION First Started .
20. Thinking about this though... would this mean that everything that we can see is probably all roughly moving the same way as us but expanding, as predicted by the big bang theory? Everything we see is from one small section of one side of the explosion, which is still spreading out as we make our way away from the point of the inital cause, provided that the big bang theory is correct?