An even less well-understood entity, dark energy, appears to be accelerating the expansion of the universe, and is thought to account for nearly three-quarters of the mass–energy content. Galaxies appear to be bound together with invisible dark matter, which is thought to make up almost a quarter of the entire universe’s mass–energy content. However, gravity acting on ordinary matter cannot explain all of the large-scale structure seen in the heavens. In the currently favoured “cosmological constant and cold dark matter” model (ΛCDM) of cosmology, general relativity has successfully explained many aspects of the universe, including the cosmic-microwave background, gravitational lensing and large-scale structure. Since its publication in 1916, the general theory of relativity has defied all experimental attempts to prove it wrong. Done by physicists in Denmark who measured gravitational redshift, the research appears to rule out some alternative models of gravity – particularly those that deny the existence of dark matter. Webinars Tune into online presentations that allow expert speakers to explain novel tools and applicationsĪ study of light coming from galaxy clusters has yet again given the thumbs up to the general theory of relativity, Albert Einstein’s famous theory of gravity.Video Watch our specially filmed videos to get a different slant on the latest science.Podcasts Our regular conversations with inspiring figures from the scientific community.
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