mass can never be created????

Question

ive often read the fact that mass can never be created nor be destoyed but then the universe is also expandinf\g which means that there is more dark matter created...which has its own mass...now from where does this mass come from..i woudl also liek to piont out 90% of the mass of the universe is dark matter.....

Answer 1

An electron and a positron can be created simultaneously. It comes out of a gamma photon moving near any heavy nucleus. It also can happen out of nothing at all in vacuum!!
Read about quantum fluctuations.

Answer 2

The universe is expanding and increasing. I can explain you this by an example think of a balloon insert air in it and look and observe that the size increases so could you say that the balloon's mass have increased but instead the matter of the balloon is stretching and same is the case of universe. But question arises is that the balloon will stop expanding after a particular stage. So up till when the universe will expand. Scientists say that because of a lot of mass in the universe the expanding will continue for a lot of times.
And also a lot of forces act on the universe's dark matter.

Answer 3

it is true that mass can never be created nor destroyed.
in your view the universe is expanding because more dark matter is being added.
it is not true.
in fact, the mass in the universe(what you call the extra dark matter) is being expanded.
hence the universe is expanding.
proof:-
according to the bigbang theory, the universe was in a compresed state in the form of a ball.
that ball exploded because it could not withstand the pressure exerted by the inner matter.
when it exploded, the present universe was formed.
now also, the matter which was once inside the ball is exerting more pressure due to which the universe is expanding but not because some extra dark matter is being added.

Answer 4

I'm not sure about this, but can't mass be created from energy, as in the Big Bang, where a massive amount of energy transformed to matter, thus creating the universe.
Maybe the expansion of the universe is just this ongoing proces

Answer 5

Mass can be created from energy and the reverse is also possible at least in theory. But your assumption that dark matter is created when the universe expands is totally wrong.

Answer 6

The correct statment is energy cannot be created or destoryed. Quantum physis treats matter and energy the same and one can be converted to another. There is no loss of matter or energy in the process. We convert mass to energy all the time I don't believe we can convert energy into mass but I suspect it's possible in theory.

Answer 7

That is old and is for use in our scale of reality. Newtonian. Relativity and quantum mechanics both demand that matter can be converted to energy and vice versa. This is evident as reality in high energy collider experiments, and in nuclear explosion experiments. This is usually covered in the late middle high school physics courses, certainly in the college and university introductory courses.

Answer 8

when i was born i weighed about 10 pounds, now i weigh around 200 pounds - i think mass has been created in the aging process

Answer 9

Your statement is wrong.

WE can not create mass. We can however destroy mass. The whole point of nuclear energy is making mass into energy.

Answer 10

I created mass this morning when i went to the bathroom......