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For every type of particle that exists there is an anti particle with the opposite electrical charge, and when they meet they cancel each other out.
It thought that the Big Bang produced equal quantities of matter and antimatter, which should have completely annihilated each other within buy cheap jordans from china moments. Yet instead we ended up with a universe made of matter and no one can be sure why.
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Two of the most popular theories for what behind dark matter have involved interacting massive particles and astrophysical compact halo objects or WIMPs and MACHOs, for short.
(Sources: BBC, NASA, New Scientist, PBS, Live Science.)
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The foundations of the modern understanding of the atom was formed in the late 1700s/early 1800s after the English born chemist John Dalton (1766 1844) began exploring atomic weights and structures. Dalton conducted experiments, worked out some atomic weights, and invented symbols for atoms and molecules. His notable conclusions are listed below.
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