What will happen if antimatter and matter have the same number in the universe?

Answer 1

Probably not. The universe has been here a long, long time. There is a lot of matter around, though it's concentrated in galaxies and the like. Even as gravity concentrated the matter into these "islands of stars" it would have also pulled on antimatter. There would have been a lot of annihilation. Not much antimatter would have been left.

But there is more mass in the universe than can be accounted for by what we can see. It's that "dark matter" thing. There is a greater mass of "stuff" we can't see than stuff we can. Calculations based on the effects of gravity show us this. Something is pulling on stuff, exerting a large gravimetric pull, but we can't see it. Gravity is "created" by mass, and there's a lot "missing" out in the galaxy. There isn't any argument about the "missing matter" in the universe, only where it's hiding. And the hidden matter might be antimatter. It is improbable for the reasons stated above, but the probability that there is a bunch around somewhere isn't zero.

Answer 2

Scientists have been able to create very small amounts of antimatter, no more than a few atoms at at a time

Only a few labs are capable of producing it and the only types we been able to produce are antihydrogen, antidueterium and antihelium :3

Answer 3

No. There doesn't seem to be any significant amount of antimatter in the Universe; and dark matter is a quite different kind of substance than normal matter.

EDIT: Antimatter has a presence in the Universe enough to worry about, but it is not a common as matter. AM fights against M, causing an explosive reaction. It has even been proposed it can launch space ships around the galaxy. Dark Matter is entirely different.

Answer 4

Matter can be loosely defined as the substance that every structure contains. As physics suggests, every substance contains very minute particles called atoms which then contains non-fundamental particles such as protons and neutrons and fundamental particles known as electrons. Within protons and neutrons we then have quarks or when grouped, we have hadrons. We shall ignore other particles and only look at protons. According to Paul Dirac, he's famous equation showed him 'two similar but concurrently different worlds' And that is where the the definition of antimatter comes in. Let us think of the proton as one world. According to Paul Dirac, it has an opposite 'world'. This 'world' is what we call an Antiproton or it's antiparticle. The similarity is that they both have the same mass. However the difference is that they have differing charges i.e an antiproton has a -ve charge. When matter and anitmatter annihilate, an UNBELIEVABLE amount of energy is released. To show you how great this energy release is, we shall calculate the annihilation of one gram of matter and one gram of antimatter. using E=MC2, E= 0.002 x (300,000,000)2 kg m2/s2 = 1.8 x 1014 J = 180 x 1012 J. This amount of energy released is double the amount of 20 KILO TONNES of TNT, and 10 times the Fat man A-bomb dropped in Hiroshima. This is a great amount of energy. This great energy release is because of the E=MC2 equation, there is complete transformation of mass into energy as compared to partly converted mass into energy during nuclear fission and fusion.