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What accounts for most of the mass in the universe?
Current theory states that it's "dark energy".
Which is thought to be more prevalent in the universe dark matter or dark energy?
Dark energy. The current estimates for the distribution of mass/energy in the Universe are approximately: 68% dark energy 27% dark matter 5% baryonic (i.e. "normal") matter
Can the gravitational potential energy of an object be negative?
No. That would require a negative mass or a negative distance, neither of which is possible.
What fraction of the mass for stopping expansion does the universe have if dark and visible matters are considered?
Depending on what source you use for reference, it seems somewhere between 68% and 75% of the universe is dark energy accelerating the expansion, and somewhere between 25% to 32% is matter (dark or visible) exerting gravitational force which would notionally be resisting that expansion. Note that dark energy itself has mass (per mass-energy equivalence) so one needs to be cautious if the subject in question is the overall mass of the universe or what fraction of the overall mass tends to oppose that expansion - which dark energy does not.
Where does heat energy tend to go?
It dissapates and joins the mass of dark energy used for hyperdrives according to Han Solo and Mass Effect.
Is it true that most of the both the mass and energy in the universe may take forms that you are unable to detect directly?
Yes, that's quite true! For more information, read sources such as Wikipedia on "dark matter" and "dark energy". Current estimates are that something around 68% of the mass-energy in the Universe is in the form of dark energy; 27% is in the form of dark matter; and about 5% matter of known types. Nobody really knows much about "dark energy" or "dark matter" - only that they exist.
What is the opposite of Dark Energy?
There is no opposite of dark energy in the sense that there exists something that is the exact opposite of dark energy. Dark energy speeds the rate of expansion of space, even empty space, and gravity, mass, or matter causes the opposite in that it causes a decrease in the rate of expansion of space in areas that have matter.
Does dark matter possess any mass and energy?
Yes, dark matter has a lot of mass. It makes up about 20% of the universe (much more than regular matter). Since it has mass, it also has energy. In fact, dark matter's mass is the main reason we even know it exists. Astrophysicists can observe its gravitational effects, though it is extremely hard to detect in any other way.
What might much of the mass of the universe be composed of?
The universe is made mostly of dark matter and dark energy, and we don't know what either of them is.
Mary weighs 533 Nand she walks down a flight of stairs 4m below her starting point what is the change in marys potential energy?
That's a mighty heavy woman! Anyway, potential energy is calculated as mgh, that is, mass x gravity x height. To calculate in SI units, mass should be in kilograms, gravity is about 9.8 meters per second square, and height in meters. Since she goes down, the change in potential energy is negative - her negative energy decreases.That's a mighty heavy woman! Anyway, potential energy is calculated as mgh, that is, mass x gravity x height. To calculate in SI units, mass should be in kilograms, gravity is about 9.8 meters per second square, and height in meters. Since she goes down, the change in potential energy is negative - her negative energy decreases.That's a mighty heavy woman! Anyway, potential energy is calculated as mgh, that is, mass x gravity x height. To calculate in SI units, mass should be in kilograms, gravity is about 9.8 meters per second square, and height in meters. Since she goes down, the change in potential energy is negative - her negative energy decreases.That's a mighty heavy woman! Anyway, potential energy is calculated as mgh, that is, mass x gravity x height. To calculate in SI units, mass should be in kilograms, gravity is about 9.8 meters per second square, and height in meters. Since she goes down, the change in potential energy is negative - her negative energy decreases.
When matter created gravity as antimatter why not create anti-gravity?
"Antimatter" is not negative mass. Mass is a positive quantity for both matter and antimatter. So gravity is always attractive, even if one of the masses in the relationship happens to be antimatter. If such a thing as negative mass exists, then the forces between it and a lump of normal mass would be repulsive ones. Antimatter is observed routinely, but no evidence of negative mass has ever been observed. When matter & antimatter annihilate energy is released per E = mc2 where m corresponds to the sum of their masses. If the antimatter had negative mass then instead of a positron/electron annihilation releasing energy corresponding to twice the electron mass (as it does) the mass of the electron and negative mass of the positron would cancel resulting in no energy release (this does not happen). This proves that both matter & antimatter have positive mass, without even referring to gravity. As they both have positive mass their gravity will be attractive not repulsive.
What is the physical property of non-matter?
Perhaps you should first clarify what you mean with "non-matter". There are a lot of things that could fall under that category: perhaps antimatter (which, however, is a type of matter, but with some properties to "normal" matter); energy (which, however, does have a mass equivalent, so it is also "matter" in a way); dark matter and dark energy (both of which also have mass!); empty space, etc.
