The presence of ionized gas around galaxies with moves with them leaves a trace in the microwave background radiation (left panel) which can be detected knowing the pattern of velocities of the galaxies provided by the map of fluctuations in their redshift (right panel). Credit: Carlos Hernández-Monteagudo (IAC) Scientists estimate […]

The Dark Energy Camera imaged 10 selected areas of the sky called deep fields. The multiple images of each provided astronomers with a glimpse of distant galaxies and how they are distributed throughout the universe. (Image credit: Dark Energy Survey) The largest galaxy survey ever made suggests that our cosmos […]

The Hobby-Eberly Telescope. Credit: Marty Harris, McDonald Observatory, UT Austin The universe we see is only the very tip of the vast cosmic iceberg. The hundreds of billions of galaxies it contains, each of them home to billions of stars, planets and moons as well as massive star-and-planet-forming clouds of […]

After galaxies began to form in the early universe, the universe continued to expand. The gravitational attraction between galaxies worked to pull galaxies together into superclusters, while dark energy and its resulting cosmic expansion worked to drive these clusters apart. As a result, the universe is filled with tight clusters […]

ANIMATION The universe is expanding, and it expands a little faster all the time. Scientists call the speeding up of this expansion cosmic acceleration. This growth increases the distance between points in the universe, just like stretching a rubber sheet would make points on that sheet move further and further […]

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 […]