Dark matter is believed to be a form of matter thought to account for approximately 85% of the matter in the universe and about 27% of its total mass–energy density or about 2.241×10−27 kg/m3.

Heat is a type of energy, but temperature is not energy. Heat depends on mass of the substance, however; temperature does not depend on the quantity of matter. If you give heat to a matter, you increase its temperature or change its phase.

But an object with zero energy and zero mass is nothing at all. Therefore, if an object with no mass is to physically exist, it can never be at rest. Light is such an object, and the universal speed limit c is named the speed of light in its honor. But light is not the only massless object.

Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter.

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It won’t bind with anything you eat. If you eat it, it won’t stay inside you; it’ll drift away as though you weren’t there. Dark matter interacts barely, if at all, with ordinary matter except through gravity. You won’t find dark matter supplements in the store.

But more-massive pieces of dark matter known as macroscopic dark matter, or macros, could lurk in the cosmos. In theory, macros could directly interact with physical objects such as human bodies, causing “significant damage,” according to the new study titled “Death by Dark Matter.”

No. There isn’t any Dark Matter and if there were it wouldn’t interact with your hand and wouldn’t be solid. Impossible to answer since “dark matter” isn’t just one thing. Baryonic dark matter is stuff like neutrinos and black holes.

This positron signature could have a variety of causes, but a prime candidate is dark matter, the intangible stuff thought to make up about 98 percent of all matter in the universe. When two dark matter particles collide they can sometimes destroy each other and release a burst of energy that includes positrons.

When antimatter and regular matter touch together, they destroy each other and release lots of energy in the form of radiation (usually gamma rays). If it’s a small amount, it’s totally safe. If it’s a large amount, the gamma radiation would be enough to kill you or cause serious harm.

Antimatter does not have any special property. A given antiparticle has opposite values for certain additive quantum numbers (like charge) compared to the corresponding particle. As for why antimatter is rare, when the dust settled in the early universe, it consisted entirely of matter.

No. Antimatter has positive mass just like ordinary matter, so the black hole would merely get larger and heavier. Whatever fireworks happened inside the hole, if the anitmatter met up with ordinary matter there, would have no effect on the hole’s total matter-and-energy content or, therefore, its mass.

“When matter and antimatter meet, they annihilate each other and the mass is converted into energy–specifically, into gamma-rays. Therefore, astronomers conclude that there are not occasional ‘rogue’ galaxies made of antimatter.

PHYSICISTS have made a key measurement of anti-atoms, and found that they look just like atoms. The result means we are no closer to solving the mystery of why we live in a universe made only of matter, or why there is anything at all.

Antiprotons have also been found to exist in the Van Allen Belts around the Earth by the PAMELA module. Antiparticles are also produced in any environment with a sufficiently high temperature (mean particle energy greater than the pair production threshold).

A gram of antimatter could produce an explosion the size of a nuclear bomb. However, humans have produced only a minuscule amount of antimatter. If all the antimatter ever made by humans were annihilated at once, the energy produced wouldn’t even be enough to boil a cup of tea.

“It’s true that when matter and antimatter meet, they do annihilate in a big explosion and convert their mass to energy. Scientists are neither interested in creating nor able to create enough antimatter to make a world-destroying antimatter bomb.

Due to its explosive nature (it annihilates when in contact with normal matter) and energy-intensive production, the cost of making antimatter is astronomical. CERN produces about 1×10^15 antiprotons every year, but that only amounts to 1.67 nanograms.

Antimatter is nearly 10 times more powerful than the most powerful nuclear weapons, due to the fact that nuclear reactions only release 10% of their energy created as the blast itself. Antimatter, being antimatter, gives all 100% as the explosion. One gram of antimatter has yield of 40 kilotons.