Accelerating universe

Accelerating universe is a term for the idea that our universe is undergoing
rapid expansion. In the late 1990s, observations of type I supernova
produced an unexpected result that the expansion of the universe appears to
be accelerating. These observations appear more firm as new data has
appeared. This means that the speed with which a distant galaxy recedes from
us increases over time.

As this trend continues, there is the resultant inability to see any other
galaxies any more. This new theory of the end of the Universe has been
called the Big Rip.

The three theoretical approaches to explain this are a non-zero cosmological
constant, which may have caused cosmic inflation, an energy known as
quintessence, or dark energy.

The observation of an accelerating universe appears to present great
problems for Dyson's eternal intelligence.

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