The expanding universe research area investigates the observational and theoretical foundations of cosmic expansion, originating from general relativity and supported by redshift–distance relations, cosmic microwave background anisotropies, and large-scale structure surveys. It encompasses measurements of the Hubble parameter and its evolution, constraints on dark energy and matter content via cosmological parameters, and tests of the ΛCDM model and its alternatives. Research integrates numerical simulations, precision cosmology, and data from supernovae, baryon acoustic oscillations, and gravitational lensing to characterize the expansion history, probe deviations from general relativity, and refine models of early- and late-time cosmic dynamics.
According to current understanding, the universe is expanding—and is doing so at an accelerating rate. This is believed to be caused by something called the cosmological constant, which was first proposed by Albert Einstein ...
Astronomy
Jul 21, 2026
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Astronomers have used the ages of more than 155,000 stars in the Milky Way to independently estimate the age of the universe, and their findings may be good news for the standard cosmological model. The new research was reported ...
Our universe is known to be remarkably homogeneous and isotropic. This essentially means that matter is distributed evenly throughout the universe and that it looks almost the same in all directions.
For nearly a century, astronomers have known that the universe is expanding. In the late 1990s, two independent teams, the Supernova Cosmology Project, led by Saul Perlmutter, and the High-Z Supernova Search Team, led by ...
Modern cosmology rests on a simple assumption: If we look on large enough scales, matter should be distributed evenly, with no preferred direction within the cosmos. This is known as the cosmological principle.
Astronomy
Jul 1, 2026
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Second only to black holes, neutron stars—incredibly dense star remnants—are the densest objects in the universe. When neutron stars collide, they create ripples in the fabric of space and time that we can detect on Earth.
Astronomy
Jun 30, 2026
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Research led by the Tata Institute of Fundamental Research, Mumbai, along with Professor Subir Sarkar from the University of Oxford, questions the widely accepted argument that the expansion rate of the universe is accelerating ...
Astronomy
Jun 22, 2026
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Our universe's expansion is still accelerating despite recent claims suggesting otherwise, an international team of astrophysicists says.
Astronomy
Jun 10, 2026
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A supermassive black hole lies at the heart of every galaxy, including the Milky Way. When a black hole is active, it pulls material in as a whirlpool of high-temperature gas and dust. As this cosmic material piles up and ...
Astronomy
Jun 8, 2026
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Mathematicians are challenging the idea that dark energy is responsible for the accelerating expansion of the universe. In a new paper published in Proceedings of the Royal Society A, mathematicians from the University of ...
Astronomy
May 28, 2026
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