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What did redshift tell Hubble about the universe?
The redshift was not "invented" by anyone. It is a natural phenomenon that has always been with us. It was the Austrian mathematician and physicist Christian Doppler who first described the effect in the year 1842. The idea was latched onto by astronomers who (eventually) applied it to observations of more and more distant galaxies. These observers found that by taking the colors of the observed light and shifting them up, the light looked "more normal" to the observers. It was then easy to deduce that the galactic light sources were receding, and the the speed of recession could be calculated based on their redshift. Links can be found below for more information.
How can you tell that some galaxies are far away and moving rapidly towards us?
You can tell by the blueshift in the spectrum; the only reasonable explanation for this blueshift is the Doppler effect. - Please note that most galaxies are moving away from us, not towards us.
Who has the most powerful telescope?
The most powerful telescope is the Hubble telescope, please note you did not ask where.
What is the meaning of contrary moving note?
The notes are moving
Does distance between stars change over time?
Constantly. They're all moving in slightly different directions at significant speeds. Note that the sun circles the galaxy every quarter billion years.
What is the word for moving a car payment to the end of the note?
Deferment
When does Jupiter retrograde?
A retrograde motion of an OUTER planet happens when Earths orbit catches up with and overtakes the planet as Earth orbits the Sun. For Jupiter it is observed to be in retrograde (moving backwards as measured against the fixed stars) motion for 121 days a year. NOTE Jupiter is not actually moving backwards, it just appears to.
What is the meaning behind the terms red-shift and blue-shift?
Red shift and blue shift refers to light becoming more reddish or more blueish. A useful analogy is the Doppler effect with sound. The sounds of an approaching police car has a higher pitch than normal, whilst if it is receding the pitch would be lower. Objects that make noise and are moving towards you make a higher pitched sounds, and objects that are moving away from you make a lower pitched noise. The same things happens with light; objects moving towards you appear more blueish (and are referred to as having been blue shifted) and objects moving away appear more reddish. We are not aware of this in normal life because the speed of light is huge, and only objects moving away or towards you with a non-negligible fraction of this speed will have any significant blue or red shift. It is important to note that there is a difference here with the red shift usually used by cosmologists. They often specify the distance to a far away galaxy by its red shift. This can be done because of Hubble's Law which says that the more distant a galaxy is the faster it recedes from us (and therefore the more red shifted it is). Hubble's Law thus provides a way to relate red shift to distance. The important difference is the cause of the red shift. Whilst it is true that a distant galaxy may move away from us, it is just as likely to move towards us (and thus appear blue shifted). However, the main cause of the cosmological red shift is the expansion of the Universe! As light travels towards us space itself is stretched out by the expansion of the Universe and the wavelength of light is stretched because of this. The wavelength of light thus increases, which also causes red shift (since red has a higher wavelength than blue light for example). The longer light traveled (i.e. the further the galaxy is away) the more this happens, thus the more red shifted and we recover Hubble's Law.
How did Hubble determine the universe was expanding?
The basic idea is that the farther away a galaxy is from us, the faster it moves away from us. You can get a rough comparison of distances to galaxies from their brightness and apparent diameter; and you can measure the speed by which they move away from us using the Doppler effect. The above is the standard talk. Following is the non-standard talk. It is easier to see larger things, especially in the distance. So, the larger stars are seen in the distance (maybe). In any event, light leaving a star may be likened to mass leaving the Earth. That is, the higher (further away from the star or from the Earth) an "object" goes, the more kinetic energy it loses to gravitational potential energy. When the "object" is light, it does not slow down. Nevertheless, it loses energy -- it reddens. So star light from far-away stars is reddened because it moves against the gravitational potential of the star. Nearer, stars have less reddening (less climbing out of a gravitational well). Note, speed is not mentioned! If the star were not moving relative to our Sun or if the star were moving away from our Sun -- in both conditions -- you would see a red shift. Hmm, more work has to be done. But you can easily see the problem of blindly believing Hubble, for there are two reasons that could explain redness.
What happen to the e as you move the slide to the right or left?
Moving a slide to the right sharpens the pitch (makes it higher) by raising the note. Moving the slide to the left flattens the pitch (makes it lower) by lowering the note.
What does moving in stepwise motion mean?
Moving in stepwise motion means moving from one note to an adjacent note in a scale, either ascending or descending, without skipping any notes in between. This results in a smooth and connected melodic line without large leaps between notes.
Is Number the Stars a good book?
I personally enjoyed it very much. Also note it's a Newberry winner.Yes, Number the Stars is a good book.
