Cosmology is a research area in astrophysics that investigates the large-scale properties, origin, composition, and dynamical evolution of the Universe as a whole. It integrates general relativity, quantum field theory, and observational astronomy to construct and test models such as the ΛCDM paradigm, characterized by dark energy, cold dark matter, and baryonic matter. Cosmology addresses the expansion history, cosmic microwave background anisotropies, structure formation, and primordial nucleosynthesis, using data from galaxy surveys, gravitational lensing, supernovae, and cosmic background experiments to constrain fundamental parameters and probe physics at energy scales inaccessible to terrestrial laboratories.
Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short of the total matter produced in the Big Bang 13.6 billion years ago. In fact, more than half of ...
Astronomy
Apr 14, 2025
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Astronomers have peered back in time to find what looks like a population of "hidden" galaxies that could hold the key to unlocking some of the universe's secrets. If their existence is confirmed it would "effectively break ...
Astronomy
Apr 10, 2025
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Researchers from the University of Waterloo have proposed a new method to measure the Hubble constant that could help resolve one of modern cosmology's pressing puzzles: the Hubble tension.
Dr. Richard Lieu, a physics professor at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, has published a paper in the journal Classical and Quantum Gravity that proposes a universe ...
Astronomy
Apr 8, 2025
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Teleology is the idea that some processes in nature are directed toward a goal or an end. Today, it is commonly asserted that teleology is a remnant of antiquated ways of thinking about causation, and that it is not compatible ...
The great Russian physicist and Nobel laureate Lev Landau once remarked that "cosmologists are often in error, but never in doubt." In studying the history of the universe itself, there is always a chance that we have got ...
Astronomy
Apr 3, 2025
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The Atacama Cosmology Telescope (ACT) collaboration, which includes researchers from the University of Toronto, recently produced the clearest images yet of the universe's infancy from the earliest cosmic time accessible ...
Astronomy
Apr 3, 2025
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Data from 41 million galaxies does not shake up the standard cosmological model after all. To that conclusion, to their own surprise, comes an international team of researchers including Koen Kuijken, professor at the Leiden ...
Astronomy
Apr 1, 2025
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Dark matter is a confounding concept that teeters on the leading edges of cosmology and physics. We don't know what it is or how exactly it fits into our understanding of the universe. We only know that its unseen mass is ...
Astronomy
Mar 31, 2025
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One of the Holy Grails in cosmology is a look back at the earliest epochs of cosmic history. Unfortunately, the universe's first few hundred thousand years are shrouded in an impenetrable fog. So far, nobody's been able to ...
Astronomy
Mar 23, 2025
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