As the light of the cosmic microwave background emitted 13.8 billion years ago (left image) travels through the Universe until observed on Earth (right image), the direction in which the electromagnetic wave oscillates (orange line) is rotated by an angle β. The rotation could be caused by dark matter or […]

The RAMSES simulation code is a numerical code for astrophysics and cosmology. It is based on an adaptive mesh refinement computing technique. The figure illustrates the adaptive mesh configuration based on the density of matter. Credit: CAE The Extreme-Horizon collaboration run by teams at the CEA, CNRS, Sorbonne Université and […]

UC Riverside-led team’s technique relied on determining the mass of galaxy clusters. A top goal in cosmology is to precisely measure the total amount of matter in the universe, a daunting exercise for even the most mathematically proficient. A team led by scientists at the University of California, Riverside, has […]

A GEODE scenario does not change standard formation of structure in the Universe. Universe grows from left to right. Blue regions correspond to matter. GEODEs form in green regions and migrate into black regions. Credit: Volker Springel and the Max-Planck-Institute for Astrophysics Astronomers have known for two decades that the […]

Animation For just the second time ever, astrophysicists have spotted a spectacular flash of ultraviolet (UV) light accompanying a white dwarf explosion. An extremely rare type of supernova, the event is poised to offer insights into several long-standing mysteries, including what causes white dwarfs to explode, how dark energy accelerates the cosmos […]

DESI was mounted on the 4-meter Mayall Telescope at Kitt Peak National Observatory. Kitt Peak National Observatory (KNPO) is located 56 miles southwest of Tucson, Arizona, in the Schuk Toak District on the Tohono O’odham Nation. KPNO is administered by the NSF’s National Optical-Infrared Astronomy Research Laboratory (NSF’s OIR Lab) […]

The values of the energy density of matter (Ω_m) and dark energy (Ω_Λ) in the Universe measured from different cosmological data. Credit: Seshadri Nadathur A new paper has shown how large structures in the distribution of galaxies in the Universe provide the most precise tests of dark energy and cosmic […]

A still image from a simulation of the formation of dark matter structures from the early universe until today. Gravity makes dark matter clump into dense halos, indicated by bright patches, where galaxies form. In this simulation, a halo like the one that hosts the Milky Way forms, and a […]

The blue areas expand more slowly than expected, the yellow areas faster. In isotropy, the image would be monochromatic red. Credit: © Konstantinos Nikolaos Migkas, Uni Bonn/Astronomy & Astrophysics Study by the Universities of Bonn and Harvard raises doubts about basic assumption for the universe. No matter where we look, […]