How far is it to space, the Moon, the Sun, the stars, etc? If antimatter does exist, locating it may be a problem.
Next Page: While it is technically possible that substantial amounts of antimatter do exist somewhere in the universe , isolated in some way from normal matter , no substantial quantities of antimatter have actually been discovered.
However, the concept of negative energy was unknown to scientists at that time. That question took much longer to answer than did Dirac's original problem. What is a planet?
Antihydrogen Experiment: The insight opened the possibility of entire galaxies and universes made of antimatter. The asymmetry problem. Antimatter image gallery. For example, for the electron there should be an "antielectron", or "positron", identical in every way but with a positive electric charge. The apparent asymmetry of matter and antimatter in the visible universe is one of the greatest unsolved problems in physics.
The starting point is the Antiproton Decelerator , which slows down antiprotons so that physicists can investigate their properties.
However, when matter and antimatter meet, they completely annihilate each other in a brilliant flash of light produced by extremely high- energy gamma photons. Which begs the question of why this huge apparent imbalance exists, and why all matter and antimatter did not just annihilate each other completely very early in the history of the universe and therefore, ultimately, why we are here at all!
User Contributions: It is assumed that, very early in the life of the universe , in a process known as baryogenesis, massive numbers of particles and antiparticles were created and did in fact annihilate each other. What is the human body and the Earth, the Sun, the Universe made of?
Antihydrogen Laser PHysics Apparatus. The tiny quantities of antimatter which scientists have managed to create in the laboratory have always been accompanied by an equal quantity of normal matter , and the two tend to cancel each other out almost immediately. If an antielectron exists, could there also be an antiproton, a proton with a negative charge? What is the electromagnetic spectrum? In 1928, British physicist Paul Dirac wrote down an equation that combined quantum theory and special relativity to describe the behaviour of an electron moving at a relativistic speed.
How fast are we traveling through space??
What are the coldest and the hottest objects in the universe? But when matter and antimatter come into contact, they annihilate — disappearing in a flash of energy. The dilemma was soon resolved, however. It has been calculated that this apparently tiny imbalance in the early universe would be sufficient to make up the amount of matter presently observable in the universe.