The Lambda-CDM model attempts to describe the entire universe by assuming that the entire universe is both isotropic and homogeneous. This assumption also applies to the past, present and future - incorporating a single originating big bang event, a current flat geometry and a future dominated by accelerating expansion - here, there and everywhere. Sourced from: coldcreation.blogspot.com
The current standard model of the universe, Lambda-Cold Dark Matter, assumes that the universe is expanding in accordance with the geometrical term Lambda ? which represents the cosmological constant used in Einstein’s general relativity. Lambda might be assumed to represent dark energy, a mysterious force driving what we now know to be an accelerating expansion of space-time. Cold dark matter is then assumed to be the scaffolding that underlies the distribution of visible matter at a large scale across the universe.
But to make any reasonable attempt at modelling how the universe is – and how it unfolded in the past and will unfold in the future ? we first have to assume that it is roughly the same everywhere. (...)
Read the rest of Astronomy Without A Telescope – Assumptions (649 words)
© Steve Nerlich for Universe Today, 2011. | Permalink | No comment | Add to del.icio.us
Post tags: Cosmological principle
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Full story at http://www.universetoday.com/84730/astronomy-without-a-telescope-assumptions/
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