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What model asserts the universe will stop expanding A High Density Universe B Low Density Universe C Critical Density Universe D both A and C or E none of the above?
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How is the universe expanding even if atom can't be created?
It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.
What does dark matter have to do the critical of the universe?
Dark matter is crucial for understanding the critical density of the universe. The presence of dark matter significantly increases the total mass and therefore the gravitational pull of the universe, which affects its overall structure and expansion. Without accounting for dark matter, the observed gravitational effects would not align with the predicted critical density required for a flat universe.
Dark energy seems to be accelerating the expansion of the universe causing what?
That means that the Universe expands faster and faster. It causes the Universe to grow, and the general density of matter in the Universe to decrease over time.
What does measuring the amount of deuterium in the universe allow us to set a limit on?
The density of ordinary (baryonic) matter in the universe.
What has density and does everything that is matter have?
everything in the universe has density because everything is made up of matter
What does it mean when you say that the universe is below the critical density?
If the universe is ever to stop expanding and start contracting there has to be a certain amount of material (mass). This amount is called the 'critical density'. So far as is known to date the universe does not have sufficient mass to stop expanding, hence it is below the critical density.
How is the universe expanding even if atom can't be created?
It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.
What is critical density?
The term critical density refers to the value in which the Universe is at balance. This also refers to the stopping of expansion.
Compare and contrast average density and critical density?
the average density is the total amount of matter in the universe, whereas the critical density is about 10 to the -26th power kg/m cubed (to the third power), the dividing point between a closed or open universe.... :)
What is a close universe?
The universe may be: 1) "open", which means it will continue to expand forever but at a decreasing rate. 2) "flat", which means it will eventually stop expanding but never reverse. 3) "closed", which means the universe will expand to a maximum size and then collapse in upon itself in a reversal of the big bang. The total mass-density of the universe determines which scenario will be realized. At a critical mass-density, the universe is flat. Some research has drawn scientists to believe the expansion of universe is actually accelerating. That means that the universe may actually be expanding more and more rapidly, due to a force called "dark energy". The existence of this dark energy would complicate all of the above scenarios.
How dense is dark matter?
This can be answered in two steps: 1) What is the average density of all gravitational matter in the Universe? It has surprised astrophysicists that this density is extremely close to the "critical" density; above which our Universe eventually collapses in itself, and below which our Universe expands forever. This critical density is about 5 x 10^-30 grams per cubic centimeter. 2) How much of the mass of the Universe is NOT dark matter? What shocked astrophysicists even more was determining that the average density of all luminous matter was only about 20% of the critical density. Thus, about 80% of the measured density of our Universe can be accounted for via stuff that gives off light. The ratio of hydrogen to helium to deuterium in our Universe puts an upper limit on the density of baryonic matter in our Universe. This calculation also shows that the density of baryonic matter can not be more than about 20% of the critical density. These two, completely independent calculations of the amount of luminous and of baryonic matter -- the stuff we understand -- in our Universe have left scientists with little choice but to conclude that 80% of the gravitational mass in our Universe is composed of something we don't understand. And that's why we call it "dark" matter. Since the Universe has a density of 5 x 10^-30 grams per cc, and only 80% of that is dark matter, then the latter's average density is about 4 x 10^-30 grams per cc.
What is the big bang theory density?
The Big Bang Theory states that the entire Universe came into being after rapidly expanding from a singularity of infinite density.
What has the universe been doing since the Big Bang?
Space has been expanding, resulting in a daily decrease in the density of matter.
What is the shape of the universe?
Scientists figured out three general possibilities:1.) CLOSED - The Universe can be like a sphere, thus having a positive curvature. (imagine a ball) Therefore it will be finite in size, but it would have no boundaries. If you would go long enough in one direction you would end up in the same place. In such a Universe, a large enough triangle would have more than 180 degrees and parallell lines would eventually meet. A closed Universe would end up in a 'Big Crunch', meaning that eventually it would stop expanding and due to its own gravity it would shrink back. We live in such a Universe, if its density is greater than a so called critical density.2.) FLAT - The Universe is like a sheet of rubber that can be pulled in every direction forever, thus its space is infinite and would have no boundaries. Triangles add up to 180 degrees and parallel lines remain parallel, just like on a sheet of paper. However, don't get confused in here. I used the analogy of a sheet of paper or rubber, to explain that the geomatrical characteristincs would be the same as of a 2D model. The Universe is obviously not literally flat (we're not some shapeless cartoon characters, right?). Such a Universe is possible, if its density equals the critical density.3.) OPEN - The Universe is saddle-shaped, thus having a negative curvature. Therefore its space would be infinite and it would have no boundaries. It would keep expanding forever at an accelerated rate. Large enough triangles would have less than 180 degrees and paralell lines would move apart if long enough. If the Universe's density is smaller than the critical density, then we are part of such Universe.----Which one would you pick? :-P
Is the universe the creation of matter or the expansion of matter which is pre existing?
The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.
How does density change as the universe expands?
The density of what? Any metal, liquid, etc. will have the same density since density depends on mass and volume of the sample (not volume of the universe).
What does dark matter have to do the critical of the universe?
Dark matter is crucial for understanding the critical density of the universe. The presence of dark matter significantly increases the total mass and therefore the gravitational pull of the universe, which affects its overall structure and expansion. Without accounting for dark matter, the observed gravitational effects would not align with the predicted critical density required for a flat universe.
