Dark Matter And Dark Energy

摘要

Observations continue to indicate that the Universe is dominated by invisible components - dark matter and dark energy. Shedding light on this cosmic darkness is a priority for astronomers and physicists.rnWhat is the composition of the Universe?rnIn terms of their contribution to the mean energy density, the contents of the Universe are approximately 75% dark energy, 20% dark matter and 5% normal (atomic) matter, with smaller contributions from photons and neutrinos. These measurements rely on the validity of the hot Big Bang model, general relativity and the cosmological principle (that the Universe is uniform on the largest scales). The breadth and depth of experiments and observations that support these underlying tenets give us confidence that this model of the cosmos has a solid foundation.