So far, there is NO known way to change the past.
Currently, antimatter has uses in the medicine, fuel, and weapons industries. In medicine, they are shown to help cure cancer. Antimatter, while scarce, can be a potential substitute for fuel. In weapons, antimatter serves use as a trigger for nuclear weapons.
There are currently some really hard, tough and strong materials out there, but we have ways of damaging or breaking them without the use of antimatter. It is possible that something of a "science fictional" nature could be envisioned, but in reality, not as far as we've been able to find.
it can't for now
Yes.
Most antimatter exists as subatomic particles produced either in radioactive decay or large particle accelerators. No significant quantities have been made and the only antimatter atoms ever produced have been antihydrogen. Any antimatter that came in contact with liquid nitrogen would annihilate both itself and part of a nitrogen atom, releasing energy that would heat the remaining liquid nitrogen. If you could somehow produce a quantity of antimatter equal the the amount of liquid nitrogen, when they came in contact instead of cooling the antimatter there would be total annihilation of both materials resulting in an explosion on the order of teratons of TNT equivalent as the temperature of the products jumped to hundreds of millions of degrees kelvin to billions of degrees kelvin!!!!!
it is not possible because estar is temporary so there is no way that you can
Sometimes it can be possible. This depends on the context.
In the past, it was sometimes used as a synonym for antimatter. Another term you might see in older materials is CT, or contraterrene, matter. The paper in which it was first pointed out that negative mass was not necessarily a contradiction in terms was published in 1957, so any use of the term before that probably means what we today would call antimatter. Nowadays the term is usually used for a hypothetical form of matter which has a negative mass. Some physical theories allow for the existence of this kind of matter, which may mean either that it is in fact possible, or it isn't and the theory is incomplete.
Antimatter is stored in specialized containers that use magnetic fields to keep it away from regular matter. This prevents annihilation, which occurs when antimatter comes into contact with matter, releasing a large amount of energy. The containers are kept in a vacuum to minimize the chance of contact with any particles. Additionally, the containers are cooled to very low temperatures to slow down the movement of the antimatter particles, reducing the likelihood of annihilation.
AnswerIn our part of the universe, antimatter absolutely exists. We use it all the time for medical imaging. For instance, the "PET" in PET scan stands for Positron (an antimatter particle) Emission Tomography. However, it is not plentiful by any means and it is very short-lived...
"May have had" can be used for past possibility. She was sick last week. She may have had the flu, or she may have had a cold. (It was possible that she had the flu, and it was possible that she had a cold.) She is acting strange tonight. She may have had too much to drink. (past possibility) May have + past participle = past possibility. The grass is damp (a little wet). It may have rained last night.
"Yes, there are cribs by Graco that offer a changing table at the end of the crib that can fold up for use and down when not using. Usually changing tables come on top of a the babies dresser but for space concerns the crib changing table is a great option."