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How do red shifts were used by cosmologists to determine that the universe is expanding?
A Galaxy's red-shift can be used to determine how fast it is travelling away from you. The opposite is "blue-shift" which is what happens when the Galaxy is travelling towards you.The first astronomers, such as Edwin Hubble, to analyse the light coming from distant galaxies discovered that almost all of them were red-shifted, indicating that they were almost all heading away from us. This was the first indication that the universe was expanding.
What causes a cosmological redshift?
A redshift occurs when the wavelengths increase in objects by light or electromagnetic radiation levels in an object. In cosmological redshift also has to do with light; however, instead of an increase in wavelengths, there is an expansion of the universe.
What causes hotsprings?
Heat from Earth's interior coming into contact with groundwater.
When you see a lunar eeclipse were does the reddish light come from?
it is from the sun and the moon coming in line with each other that is what causes an eclipse first of all but the sun is what causes that
Why are the light rays coming from a distant object are assumed to be parallel?
Instead of parallel rays, consider the light as a wave front. It leaves the source in a spherical wavefront. At a certain distance the sphere is so large and the curvature of the wavefront becomes so small that it can be considered locally flat, and behaves optically as though it were flat. At that point, the flat wave front is equivalent to parallel rays (which are perpendicular to the front).
What cause changes in the light coming from distant stars and galaxies?
The apparent redshift is caused by the Doppler Effect; the frequency of waves is increased by an approaching source and decreased by a leaving source. Since the fgrequencies we see from stars are slightly lower than they should be, we know that the stars and other objects are moving away. The Doppler Effect causes changes of light emanating from distant stars and galaxies.
Why do scientist study the light coming from distant galaxies?
They study distant galaxies because they want to know whats out in other galaxies and how many planets it has
How do red shifts were used by cosmologists to determine that the universe is expanding?
A Galaxy's red-shift can be used to determine how fast it is travelling away from you. The opposite is "blue-shift" which is what happens when the Galaxy is travelling towards you.The first astronomers, such as Edwin Hubble, to analyse the light coming from distant galaxies discovered that almost all of them were red-shifted, indicating that they were almost all heading away from us. This was the first indication that the universe was expanding.
Who first propsed that the universe is expanding?
The astronomer Edwin Hubble was the first to find evidence of the expansion of the Universe, through his observations of distant galaxies. He observed that light emitted from most of the distant galaxies was more red in color. This is known as the Doppler effect or Doppler shift, where objects that emit a certain wavelength and move away from the observer appear to have a longer wavelength than the true wavelengths to the observer. It's the opposite case when objects emitting waves that are coming closer to the observer. These observations lead Hubble to believe that these surrounding red-shifted galaxies are moving away from us. Since most of the galaxies were moving away from us, and since Hubble found that with increasing distance between the galaxies there is an increasing speed at which they are moving apart, he concluded that the Universe was and still is expanding.
What causes a cosmological redshift?
A redshift occurs when the wavelengths increase in objects by light or electromagnetic radiation levels in an object. In cosmological redshift also has to do with light; however, instead of an increase in wavelengths, there is an expansion of the universe.
Evidence that the universe is expanding is best provided by the?
The main piece of evidence is the redshift of galaxies. In spectroscopy an absorption line that is redshifted indicates that the object is moving away. The farther the object is from the source of observance the faster that object travels in relation to the observer. Almost all galaxies are redshifted as opposed the our local neighborhood, the Andromeda Galaxy for instance is blueshifted because it is heading strait for us. at some point all galaxies will spread so far from each other that they will be going so fast that they reach the speed of light in respect to our position and are never seen again. Another piece of evidence is the fact that their is some warmth in space. Also known as the Cosmic background radiation. Empty Space is around 2.7 degrees kelvin which is the residual heat from the big bang. Had their not have been an explosion with a massive amount of heat and energy and everything simply was, then empty space would be absolute zero. This is the two strongest arguments that support the big bang theory.
Why are some galaxies coming together?
Some galaxies are bound together gravitationally into what is called Local Groups. Because of the gravitational attraction between them they are approaching each other.
What is the definition of the distant future?
The "distant future" is a period thousands or millions of years into the future, as opposed to the relatively short period defined by "in the coming years".
Are Irregular galaxies are very large.?
Yes, they are usually of a similar size range to other types of galaxies, from a few thousand lightyears across to a million or more. Their formation is often as a result of two or more galaxies colliding, or coming close to each other.
Is there anyone studying bachelor's degree online in Bangladesh?
Yes, this form of distant learning is coming to the twilight recently
What are galaxies that move away from earth?
Most of them. except for Andromeda galaxy which is coming towards us - our Milky Way galaxy and they both will collide in 3-4 billion years(Repetition of ''Big Bang'')
How is spectrum evidence of the big bang?
Two kinds of spectra are evidence supporting Big Bang Cosmology. 1) The light coming from distant galaxies is all red-shifted, and the size of the red shift is proportional to the distance between us and the galaxy. This means that space between us and all far-away galaxies is expanding. 2) The Cosmic Microwave Background Radiation is that of a black-body of temperature 2.7K. This is ridiculously easy to explain with Big Bang Cosmology, impossible to explain with any other model.
