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What theory explains why the universe is expanding at a great speed?
Wiki User
∙ 12y ago
The cosmological theory holding that the universe is expanding, based on the interpretation of the color shift in the spectra of all the galaxies as being the result of the Doppler effect and indicating that all galaxies are moving away from one another.
The cosmogonical theory holding that a violent eruption from a singularity led to the formation of elementary particles, the subsequent formation of hydrogen and helium, and the dispersion of the galaxies from these elements
Skaterboy15
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThe Big Bang theory explains that the universe IS expanding, but does not particularly prove that assertion. Evidence our universe is expanding is both considerable and convincing--from the redshift of distant galaxies to the pervasive 3K cosmic background radiation, "echo" of the big bang.
Einstein's equations for General Relativity also suggest our universe should not be static but instead expanding. We now know the rate of expansion is slightly increasing.
Wiki User
∙ 9y agoFirst thing to understand: Big Bang Cosmology does NOT state the matter of our Universe exploded from a center point into empty space, like a bomb. Rather, it states that SPACE itself has EXPANDED, with matter becoming less and less dense over time.
Also remember a succint quote from Alan Guth: "The Big Bang theory says nothing about what banged, why it banged, or what happened before it banged."
That our Universe has been expanding at (more or less) constant rate for the last ten billion years or so is an undeniable, observational fact; no different from the fact that our Sun first appears in the east each morning. An expanding Universe, however, can be explained equally well by either Big Bang Cosmology or Steady State Cosmology. However, other observational facts -- the Cosmic Microwave Background, ratio of hydrogen to helium, ratio of decay products to decay "parents" -- show that our Universe was, about 13.7 billion years far more dense that it is today, and has been expanding ever since.
Thus, we can explain the sun rising in the east equally well as either a rotation of our Earth OR as the Sun going around our Earth. However, phases of Venus can ONLY be explained by a heliocentric solar system. In the same way, we can explain an expanding universe in multiple ways, but other facts of our Universe can only be explained with Big Bang Cosmology.
Wiki User
∙ 12y agoThe Big Bang Theory is a Creationist Theory of the beginning of the Universe similar to "Let there be light, and there was light." The Universe was confined to a small ball that exploded and expanded to the present size.
The concept of the expanding Universe is more recent. The Big Bangers assumed the Universe would expand until the force of gravity would slow and stop expansion. The finding of redshifts of "outer galaxies" led people to interpret the redshift as an expanding Universe. The cause of this continuing expansion is said to be Dark Energy. The Expanding Universe entails expansion of space not energy and matter, this is a warped definition of the the Universe as only space.
In a sense the Big Bang and the expanding Universe is a theory of the Universe defined as energy and space and the Big bang is the creation of Space.
Wiki User
∙ 10y agoThe accelerating universe can be defined as the observation that the universe appears to be expending at an increasing rate. In formal terms, this means that the cosmic scale factor has a positive second derivative so that the velocity at which a distant galaxy is receding from us should be continuously increasing with time. In 1998, observations of type la supernovae also suggested that the expansion of the universe has been accelerating since around redshift.
Wiki User
∙ 15y agoWe generally call that theory the theory of the expanding universe.
Wiki User
∙ 11y agoPretty much all the evidence we have. If you're looking for something specific, "red shift" is a pretty good one.
Wiki User
∙ 14y agoDark Energy is a force discovered by astronomers that is accelerating the expansion of the universe.
Wiki User
∙ 12y agoBig Bang theory
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What is a simple explanation for the Big Bang Theory?
Big Bang Cosmology states that our Universe has, over the last 13 billion years or so, been expanding such that the distance between every point in our Universe to every other such point is increasing. There is no center out of which matter came, no explosion, no "bang" -- just an ongoing expansion of distance between all points within our Universe. This theory has overwhelming evidence to support it, and any competing idea is reduced to stating, "I can't explain why we see what we see -- we just do." The theory makes no statement whatsoever on how this expansion started, or what happened "before" the start of this expansion.
Which best describes the big bang theory?
It is the theory that the current universe started with a "big bang". To understand how the theory arose, it has been observed that the universe is expanding. If you imagine time going backwards, then the further back you go, the smaller the universe gets, at some point the universe is so small it is a singularity. The big bang theory predicted that there would be a background noise from the explosion still detectible in deep space; the noise was detected - in fact, it's a problem in radio astronomy that there is always noise present.
How does background radiation support ''the big bang theory''?
Among other things, our GPS systems, defense systems and communications networks would not work properly if we did not know how to adjust for relativistic effects as predicted by Einstein's equations. Relativity has been verified in a number of ways and has not yet been refuted, so relativity has helped shape and direct a great deal of subsequent research. Relativity is also helping us, little by little, come to better cosmological concepts.Disagreement:(1) Apparently our GPS systems do not use Special Relativity, although that fact is hidden in the math. See:3. Wang, Ruyong. Successful GPS Operations Contradict the Two Principles of Special Relativity and Imply a New Way for Inertial Navigation - Measuring Speed Directly. Proceeding of the IAIN World Congress in association with the U.S. ION Annual Meeting, 26-28 June 2000, San Diego, CA.(2) Einstein created a very complete and complicated theory of Special Relativity. Beckmann realized that a simpler system could work, and he favored gravity as the "aether" for light. I think, however, that the electromagnetic fields that exist (everywhere) can "carry" the electromagnetic "waves" (i.e., light). I am not allowed to show you the link. It is amazing how far afield we can drift.
Is there a point where the universe stops?
Some say there is no end to the universe, that it is just expanding and expanding. If the universe has a center, I don't think we will be able to find it. If the Universe started from a single point, the big bang, and expanded at a huge speed then surely it must have an "end" or a "boundry". Just like a ball being blown up, It starts small and gets bigger and bigger. To add to that, if the universe started at one point as the big bang theory suggests the there has to be a center or at least a starting point. We have found the end of the universe but under Edward Hubble's theory and the general belief of today it is still expanding outwards Note: if you are looking for a short concise answer for you astronomy class above is great but if you want to really get into the subject look up the two theories above. Hope i helped. - This still does not make sense, there HAS to be a "center" of the Universe under the big bang theory, even if it is a ball or balloon blowing up, there is still a CENTER or middle of the ball or balloon. Even if there are no "edges" of the universe there is still a geometrical point of center. If the universe started from one point in space and expanded in all directions there is a center even if it is a moving central point.
How the big crunch theory explain the universe?
This refers to the idea that the Universe, which is currently expanding, might contract again, and that all matter would combine into a very small space. This seems unlikely to happen; the observational evidence shows that the expansion of the Universe is ACCELERATING - it is expanding faster and faster.
What theory says to the universe is expanding at the great speed?
In essence the big bang theory
If the hubble constant H is larger at great distances then what is happening?
The Universe is expanding at an accelerating rate.
How did the Big Bang go from being an idea to a theory?
Spectral analysis of various distant stars and galaxies showed a Doppler effect that was indicative of an expanding universe, which is exactly what one would expect if the universe had been created in a huge explosion. Since then, there has been a great deal of other astronomical observation that is consistent with the Big Bang Theory. It is very solidly confirmed.
Why distant galaxies are traveling away from us at great speeds?
This is because the universe is expanding - only the Milky Way and the Andromeda Galaxy are heading toward each other, and they will eventually collide. This is sometimes referred to as "The Big Bang Theory".
Why is the big bang theory?
There is a vast quantity of astronomical observations upon which this theory is based. We can tell by Doppler shifts in stellar spectra that the universe as a whole is expanding, and has been expanding for quite some time. If we try to calculate what the universe was like in the past, it must have been smaller than it is in the present, since expansion makes it larger. The farther back into the past you go, the smaller the universe must have been. We then extrapolate back about thirteen and a half billion years, at which time the universe was compressed into a very tiny package (sometimes called the Cosmic Egg). The time when the expansion began, therefore, would have resembled a Big Bang. In addition to the extrapolation of the overall size of the universe, we have additional confirmation in the form of our observations of the cosmic background radiation that is left over from the Big Bang. It has been analysed in great detail and it is consistent with the theory.
What is a simple explanation for the Big Bang Theory?
Big Bang Cosmology states that our Universe has, over the last 13 billion years or so, been expanding such that the distance between every point in our Universe to every other such point is increasing. There is no center out of which matter came, no explosion, no "bang" -- just an ongoing expansion of distance between all points within our Universe. This theory has overwhelming evidence to support it, and any competing idea is reduced to stating, "I can't explain why we see what we see -- we just do." The theory makes no statement whatsoever on how this expansion started, or what happened "before" the start of this expansion.
Theoretically the universe will keep expanding and eventually even atoms' parts separate into pure energy so why could such energy not lose momentum then collapse and re-explode?
Great question. I can tell you that nobody knows for sure. The "current best answer" is that there is insufficient mass to cause the expanding universe to stop and come back together. In fact the expansion is accelerating!
Which best describes the big bang theory?
It is the theory that the current universe started with a "big bang". To understand how the theory arose, it has been observed that the universe is expanding. If you imagine time going backwards, then the further back you go, the smaller the universe gets, at some point the universe is so small it is a singularity. The big bang theory predicted that there would be a background noise from the explosion still detectible in deep space; the noise was detected - in fact, it's a problem in radio astronomy that there is always noise present.
Who first proposed the geocentric Solar system Theory?
The idea first came from Aristotle, the Great philosopher of the fourth century B.C. Aristotle was the first to theory that the earth was the center of the universe.
How do you know the big bang occurred?
Well, for starters, if you take everything that is expanding at this moment and reversed it, everything would end up back to a very small dense object. Besides, the big bang explains a majority (not everything) of what is happening around us in great detail.
Which of the following best explains how the point of view of Source A disagrees with the point of view of Source B?
Source A argues that colonial expansion has ruined Great Britain, whereas Source B argues that Great Britain has a duty to continue expanding its empire.
Why was Cyrus described as ''the great''?
His great achievement of expanding the Persian tribe into an empire covering western Asia.
