Lambda-CDM Model

A long-simmering disagreement over the universe's present-day expansion rate shows no signs of resolution, leaving experts increasingly vexed

A new map of cosmic expansion suggests that dark energy evolves over time, hinting that the universe doesn't work the way we thought it did

A new image from ESO's Very Large Telescope provides what these astronomers called "our clearest view yet" of a filament in the cosmic web. The post A filament of the cosmic web! Clearest image yet first appeared on EarthSky.

Dark energy -- an unknown energy source that is causing our Universe's expansion to accelerate – doesn't actually exist, according to new research.

There's increasing evidence that astronomical theories don't match the observations. Is it time to rethink our story of how our universe came to be? The post MOND and more. Does the universe need a rethink? first appeared on EarthSky.

Measurements of cosmic expansion using Cepheid variable stars continue to create tension.

By measuring the motions of stars in the Draco dwarf galaxy, the Hubble Space Telescope was able to map the density profile of dark matter.

On the largest of cosmic scales, the best description we have of our Universe is known as the ΛCDM model with an inflationary hot Big Bang: our consensus cosmology. It tells us that we have a…

Dark energy's grip on the cosmos could be more fickle than scientists once believed.

A tiny collection of a few dozen stars may have been orbiting the Milky Way for billions of years. This would probably only be possible thanks to dark matter. An international research group has di...

The faint star system — the tiniest Milky Way satellite ever found — could be under the influence of dark matter.

Rather than ripping up our fundamental models of the universe, the unexpectedly big and bright galaxies spied in the early universe by JWST probably have astrophysical explanations

The James Webb Space Telescope could target tiny and bright galaxies in the early universe to unveil some secrets about the universe's most mysterious stuff,...

As measurements of distant stars and galaxies become more precise, cosmologists are struggling to make sense of sparring values.

Researchers at Swinburne University of Technology have contributed to a landmark study that complicates our understanding of the universe.

University of Chicago astronomer Wendy Freedman tells us how she's searching for an answer to the Hubble tension — a discrepancy between measurements of our universe's expansion that could threaten the dominant model of how the universe has grown since the Big Bang.

Scientists made a twin version of our universe, showing the evolution of all forms of matter and energy, in the biggest cosmological computer simulation to date.

An international team of astronomers has carried out what is believed to be the largest ever cosmological computer simulation, tracking not only dark but also ordinary matter (such as planets, stars and galaxies), giving us a glimpse into how our universe may have evolved.

Einstein's theory of gravity—general relativity—has been very successful for more than a century. However, it has theoretical shortcomings. This is not surprising: the theory predicts its own failure at spacetime singularities inside black holes—and the Big Bang itself.

Astronomers have spotted a gigantic void they believe to be a baryon acoustic oscillation — a relic from when the universe was a fiery plasma soup