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Dark Matter Was Postulated By Fritz Zwicky In 1934
You might think you learned in high school that the universe is made of atoms and molecules, protons and electrons, stars and galaxies, but over the last few decades astronomers have concluded — not happily — that all this is just a scrim overlying a much vaster shadowy realm of invisible “dark matter” whose gravity determines the architecture of the cosmos. In other words, dark matter is the mysterious something that makes up a quarter of the universe and holds galaxies together. Scientists have published several Stephen Colbert Books on just this matter. Numerous scientists are actually still trusting that an apparatus called the Alpha Magnetic Spectrometer might substantiate that mysterious signals noted by other satellites and balloons in recent years are emanations from that dark matter, uncovering evidence of particles and forces that have only been theoretical reveries until now.
In 2008, a European satellite named Pamela registered an excess of anti-electrons, or positrons, in space — perhaps from collisions of dark matter particles. But the satellite had no way to tell positrons, which are exotic, from protons, which are humdrum, being the nuclei of hydrogen, and everywhere. The Alpha spectrometer does. An eight-ton assemblage of magnets, wires, iron, aluminum, silicon and electronics, it is one of the most ambitious and complicated experiments ever to set out for space. The device is a miniature version of the cathedral-size particle detectors that now line the Large Hadron Collider. The spectrometer is intended to sift the high-energy particles flying through space known as cosmic rays. On Feb. 27, 2011, the space shuttle Endeavour is scheduled to ferry the spectrometer to a permanent berth on the space station. But then again, the real objective is the shadowy part of the cosmos.
Even if dark matter won’t ever become the ultimate diet — eat it and disappear — knowing what nature is made of could be useful someday in ways nobody can dream. Einstein’s twisted spacetime, congruently impalpable to the senses, proved vital to the operations of our countless GPS networks and devices that were invented decades after Einstein’s passing. According to some physicists, the positrons from dark matter should have a unique spectral signature that the cosmic ray spectrometer can measure. If the signal abides by the model, the scientific community might fully accept dark matter. Other scientists say it will be difficult, if not impossible, to distinguish the dark matter signal from the background violence of pulsars and black holes in the local universe. And many physicists say they will not be satisfied that dark matter has been found until there is supporting data from particle accelerators and underground experiments that seek to detect the particles directly.
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