Early Dark Energy Could Explain the Crisis in Cosmology

In 1916, Einstein finished his Theory of General Relativity, which describes how gravitational forces alter the curvature of spacetime. Among other things, this theory predicted that the universe is expanding, which was confirmed by the observations of Edwin Hubble in 1929. Since then, astronomers have looked farther into space (and hence, back in time) to … Read more

NASA’s Report Details a Dark Time in American History but Finds no Direct Evidence That Webb Fired People for Their Sexual Orientation

NASA has announced the release of the James Webb History Report, a document detailing their investigation into the namesake of the next-generation space telescope that took to space on December 25th, 2021. Months before it launched, the observatory became the subject of controversy when it was revealed that Webb was involved in the so-called “Lavender … Read more

1,500 supernovas for the most precise survey of dark energy, dark matter

Two decades’ worth of observations of supernova explosions and a powerful new analysis tool has provided the most accurate accounting of dark energy and dark matter to date. Dark energy and dark matter — often collectively known as the “dark universe” — are mysterious because despite making up at least 95% of the universe’s energy … Read more

Soft devices, powered by ‘stressed’ algae, glow in the dark when squished or stretched

Nature Communications (2022). DOI: 10.1038/s41467-022-31705-6″ width=”800″ height=”530″/> Schematic of the working principle and potential applications of the biohybrid mechanoluminescence. In the light phase, the soft biohybrid robot integrated with dinoflagellate culture solution is charged with sunlight for photosynthesis to produce oxygen, providing energy for the organism. In the dark phase, the mechanically induced bioluminescence of … Read more

Researchers use purified liquid xenon to search for mysterious dark matter particles

Xenon purification system at SLAC. The two central columns are each filled with almost half a ton of charcoal, which is used to produce ultra-clean xenon for the LUX-ZEPLIN (LZ) dark matter experiment. Credit: Jacqueline Ramseyer Orrell/SLAC National Accelerator Laboratory Sitting a mile below ground in an abandoned gold mine in South Dakota is a … Read more

Why are dark matter halos of ultra-diffuse galaxies so odd?

max—Vmax distributions inferred from the Read fits (colored), together with those from the TNG50-1-Dark simulations (gray circles). The solid black lines show the median relation (Diemer & Joyce 2019), as well as 0.3 and 0.6 dex larger Rmax ("lower concentration") compared to the media. The dashed black lines denote the halo masses log10(M200/M0 = 10, … Read more

Dark energy eludes astronomers studying 100 million galaxies

Scientists are still coming up empty in the hunt for flaws in Einstein’s theory of general relativity that could explain the mysterious force driving the accelerating expansion of the universe. The researchers studied 100 million galaxies looking for signs that the strength of gravity has varied throughout the universe’s history or over vast cosmic distances. … Read more

Scientists help probe dark energy by testing gravity

This image – the first released from NASA’s James Webb Space Telescope – shows the galaxy cluster SMACS 0723. Some of the galaxies appear smeared or stretched due to a phenomenon called gravitational lensing. This effect can help scientists map the presence of dark matter in the universe. Credit: NASA, ESA, CSA, STScI Could one … Read more

Digging deep for dark matter

Almost ten kilometers of tunnels take you one kilometer underground to the Stawell Underground Physics Laboratory. Credit: Imogen Crump It takes around half an hour to get to the Stawell Underground Physics Laboratory. Thirty minutes may not sound like a long time, but that’s half an hour spent plunging downwards in a truck as it … Read more

No trace of dark matter halos

The dwarf galaxy NGC1427A flies through the Fornax galaxy cluster and undergoes disturbances which would not be possible if this galaxy were surrounded by a heavy and extended dark matter halo, as required by standard cosmology. Credit: ESO According to the standard model of cosmology, the vast majority of galaxies are surrounded by a halo … Read more