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Cosmology

Cosmology is the area of physics that studies the universe in and of itself. Through the use of incredible and ingenious methods of experimentation, cosmologists attempt to discover how the universe began, how it is developing, and how or if it will end. Questions regarding the Big Bang, dark matter, dark energy, the cosmic background radiation, and the initial formation of the fundamental particles can be placed into this category.

500 Questions

How many parallel universes are in the universe?

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Asked by Wiki User

3, or perhaps more. It depends on the theory to which you ascribe. For example, recent research done at the Princeton Institute for Advanced Studies (IAS) led to the creation of ekpyrotic theory. According to ekpyrotic theory, our universe and its creation stems from the collision of two "branes" that could theoretically and literally represent parallel universes. According to Julian Barbour, an infinite number of parallel universes exist, since every time a decision is made on either the microscopic or macroscopic level, a bifurcation is created leading to the birth of a new "universe". Long answer short, minimally 2 parallel universes, maximally infinit.

How is the validity of the Big Bang supported?

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Asked by Wiki User

It isn't ,it is against the laws of Phisics; One of the Laws of Physics;Conservation of Angular Momentum

e.g.If an object is spinning clockwise and bits fly off it they will also spin Clockwise as they fly off.

Try it at home!; get some Friends on a merry go round get some Strong guy to spin your freinds round clockwise and when they fly off,they will fly off spinning clockwise never anti clockwise.try it.

Anyway according to the big bang theory all the matter and planets came from the big bang.all the matter and planets should be spinning the same way off it-true?

How come Venus spins backward?

How come some moons spin backward than their planets?

How come whole galaxys spin backwards???????

If it all came of the big bang then why isn't it all spining in the same direction?

If the Big bang were true it should all be spinning in the same direction.

Transition A produces light with a wavelength of 400 nm Transition B involves twice as much energy as A What wavelenth light does it produce?

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Asked by Votz

Energy per photon is proportional to frequency. That tells us that it's also

inversely proportional to wavelength.

So if Photon-A has wavelength of 400-nm, then wavelength of Photon-B

with twice as much energy is 200-nm .

Is cobe a word?

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Asked by Wiki User

The Cosmic Background Explorer (COBE), also referred to as Explorer 66, was a satellite dedicated to cosmology. Its goals were to investigate the cosmic microwave background radiation (CMB) of the universe and provide measurements that would help shape our understanding of the cosmos.

What are 3 synthetic elements?

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Asked by Wiki User

Pretty much everything with an atomic number greater than 99. Nobelium, einsteinium, and rutherfordium are examples.

Are there millions of universes?

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Asked by Wiki User

We do not know. It could just be our universe or it could be groups of universes called multiverses and groups of multi verses and groups of those. We have no way of knowing but it is probable that there is extra terrestrial life who know the answer.

What is the observable universe?

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Asked by Wiki User

The observable Universe is the part of the Universe we can see from Earth because the light from all the objects in it has had enough time to reach us. Light from outside the observable Universe has yet to reach Earth.

The reason we can only see part of the Universe is because of the limited speed of light, and the expansion of the Universe, which is faster than that speed. According to Einstein, nothing in the Universe can move faster than light, but nothing stops the expansion of space from moving faster than light. This results in a large part of the Universe being completely invisible to us.

What are the main things that make up universe?

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Asked by Wiki User

The vast majority of matter in the universe is in the form of Hydrogen and Helium.

Most of the matter in the universe is thought to be?

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Asked by Wiki User

The number of protons in the Universe is estimated to be about 1079 or thereabouts. A very large number. The existence of electrons and neutrons does not alter this number very much. This was worked out in the 1930s by Arthur Eddington, from fundamental principles though recent ideas may have altered this number slightly, and the basis for it.

Recent work on effects abroad in the Universe are firming up to support the idea that there are a couple of other sources, yet to be identified with certainty, called Dark Matter, and Dark Energy.

Taking reasonable estimates for these, current numbers are that Ordinary Matter is about 4.6% of the material, Dark Matter another 23%, and Dark Energy about 72%. The Dark components are made of sub-atomic particles of which our present knowledge is very uncertain.

These outnumber Ordinary matter by some 20 to 1, but that only adds another 1 or so to the exponent of the Eddington Number of 1080.

Were there No galaxies existed before the Big Bang?

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Asked by Wiki User

No one is entirely sure what conditions were like prior to the 'big bang'. Most people would say that the big bang didn't just happen with no physical materials involved. Current thought is that all the energy that eventually became the universe was condensed into a very small space, and the space was unimaginably hot. At some point there was a very rapid expansion (some theorists suggest that at this point even the velocity of light was not a restriction to the speed of the initial expansion). Eventually, the energy was thin and cool enough so that particles began to form. Whether or not the 'big bang' happened in an already formed void (just another word for space) is also not clearly understood.

According to M theory (m for membrane, a development of string theory) there is a possibility that our universe came into being as a result of the collision of two other universes, constructed mathematically as membranes. The collision got the whole thing going, so if this model is right, not even space existed prior to the collision of the two universes. These and other universes may overlap one another, and may exist within dimensions that are folded and locked in matter at the quantum level. The development of our solar system (sun and planets) happened many billions of years after the big bang and the formation of the universe.

How is dark matter formed?

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Asked by Wiki User

The existence of dark matter has not been confirmed. It was theorized to explain discrepancies between the masses of astronomical bodies and their gravitiational effects on each other.

Some astronomers are moving away from the idea of dark matter and adopting new mathematical models to explain these issues.

though more study is on the madder and scientists have seen traces of the matter. but it is not yet comfirmed if it is just space dust hey were seeing

What evidence supports the pulsating universe theory?

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Asked by Wiki User

the pulsating universe theory is when the universe expands (the big bang) then contracts (the big crunch) and so on (it's pulsating). according to this theory right now the universe is expanding, but then it will contract

Why was Albert Einstein important?

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Asked by Wiki User

The one famous of Einstein discoveries is the photoelectric effect (the electron was emitted by photon when photon give sufficient energy and release electron from atom) that nowadays use for the application of the Solar Cell energy,

It's important due to the human civilization view of energy, even the satellite and for robot to discovered another planet as the view of astronomy

Where is dark energy?

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Asked by Wiki User

In 1998 the Hubble Space Telescope observed distant type 1a supernovae which showed astronomers a phenomena which accelerates the rate of expansion of the universe. It hasn't been declared as a 'discovery' as such because there is still a lot of disagreement over the idea and also the data received was fairly weak.

But the answer to your question is 1998. :)

What makes science so important?

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Asked by Wiki User

Science is important because it influences our lives in almost every way. Science works to understand and explain our universe in a rational way. It is used throughout our food industry weapons industry, military operations, medicine, ecology (to help keep our planet safe). It even works to explain why we act the way we do. Science (the study of the fundamental laws of nature), even in areas that we don't fully understand, underlies all the physical aspects of our lives and a great deal more.

What happens if a man travels in the velocity of light?

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Asked by Wiki User

This is a hypothetical question. According to the Theory of Relativity, this would be impossible, as one would require an infinite amount of energy. However, the calculations involving time and length indicate that the person would --->appear to us watching the person<---- to become squashed in the direction of motion, and that time would --->appear to us watching the person<----to slow down. At the limit of the speed of light, time would --->appear to us watching the person<---- to stop, and the person would --->appear to us watching the person<----to have a thickness of zero in the direction of motion. Note that for the man, everything in HIS frame of reference (if he were to look at himself while he was travelling), nothing would be amiss: time would, for him, to pass normally and he would retain his shape.

What percent of the Sun's energy intercepted by the Earth is absorbed by the atmosphere and clouds?

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Asked by Wiki User

This Answer is as Variable, considering all of the varying Parameters, as it is Crucial to Our Tenuous Situation. This percentage, as Critical as it is, in not predictable as the Output of Solar radiation is as unknowable as the powerful Incidence of detrimental Cosmic Rays.

What is electricity's origin?

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Asked by Wiki User

...by passing high speed water through turbines that drive generators to make electricity.

You tend to need reservoirs behind big dams to do this, in order to have enough water, although small scale HEP can be got from converted water wheels.

How much dark matter is there?

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Asked by Wiki User

Dark matter shows itself by its gravitational attraction. This type of evidence comes in many different forms, for example, our galaxy rotates way to fast for the amount of known matter, therefore, there must be some unknown matter.

Dark matter shows itself by its gravitational attraction. This type of evidence comes in many different forms, for example, our galaxy rotates way to fast for the amount of known matter, therefore, there must be some unknown matter.

Dark matter shows itself by its gravitational attraction. This type of evidence comes in many different forms, for example, our galaxy rotates way to fast for the amount of known matter, therefore, there must be some unknown matter.

Dark matter shows itself by its gravitational attraction. This type of evidence comes in many different forms, for example, our galaxy rotates way to fast for the amount of known matter, therefore, there must be some unknown matter.

Was their planets before the big bang?

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Asked by Wiki User

well there is a fact that you need to know here , the big bang formed the whole universe we observe nowadays and as the great astronaut carl sagan said " what happened before the big bang is not affected with what happened after the big bang " so we might never know .

What do we not know about the Big Bang?

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Asked by BridgetMulcahyfb9486

Apart from what we don't know?

The one thing we don't know, is when a supernova is going to happen. It may be tomorrow, or the year after or next century.

A bit like asking when is the next earthquake.

Does the universe have a harmonic resonant frequency?

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Asked by Wiki User

I don't think a "resonant frequency" makes much sense for the Universe. Even a single vibration would never be able to get back and forth, even if it's only through the OBSERVABLE Universe.

When did the big bang become accepted?

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Asked by Wiki User

It is difficult to identify a precise date that the Catholic Church accepted the Big Bang theory, but sometime during the late 1920s would be seem to be a plausible time. The Big Bang theory is a comparatively recent development in the history of science. Interestingly, it was a Roman Catholic priest, Monsignor Joseph Lemaître (1894 - 1966), who was also a professor of astronomy and physics at the Catholic Unviersity of Leuven in Belgium, who first published his proposal of what is now called the "Big Bang theory" in 1927. He was elected President of the Pontifical Academy of Sciences a few years before his death. Monsignor Lemaître's suggestion met with some skepticism at first, not so much from the Church, but from the scientific community, which, however, accepted his views within a few years.

How does the number of neutrons affect an atoms charge?

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Asked by Wiki User

It wouldn't change the reaction rate etc. chemically. However, it would be physically heavier and if too many neutrons are added then the atom will become radioactive and unstable, using beta emission to stabilise itself.

and i thank my wonderful physics teacher for teaching me that =]

What is the layer of atmosphere where radio signals are reflected back to the earths surface?

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Asked by Wiki User

The ionosphere bends radio waves . . . most go out into space, but a fair number hit the earth far away, and are reflected back up to the ionosphere. Radio operators call this phenomenon, "The skip".