The horizon problem is a problem with the standard cosmological model of the Big Bang which was identified in the 1970s. It points out that different regions of the universe have not "contacted" each other because of the great distances between them, but nevertheless they have the same temperature and other physical properties. This should not be possible, given that the transfer of information (or energy, heat, etc.) can occur, at most, at the speed of light. The horizon problem may have been answered by inflationary theory, and is one of the reasons for that theory's formation. Another proposed, though less accepted, theory is that the speed of light has changed over time, called variable speed of light.
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Famous quotes containing the words horizon and/or problem:
“The world of the egotist is, inevitably, a narrow world, and the boundaries of self are limited to the close horizon of personality.... But, within this horizon, there is room for many attributes that are excellent....”
—Ellen Glasgow (1873–1945)
“... your problem is your role models were models.”
—Jane Wagner (b. 1935)