redshift tagged posts

Temperature has increased about 10X over the last 10 billion years. The study probed the thermal history of the universe over the last 10 billion years. It found that the mean temperature of gas across the universe has increased more than 10 times over that time period and reached about 2 million degrees Kelvin today — approximately 4 million degrees Fahrenheit.

“Our new measurement provides a direct confirmation of the seminal work by Jim Peebles — the 2019 Nobel Laureate in Physics — who laid out the theory of how the large-scale structure forms in the universe,” said Yi-Kuan Chiang, lead author of the study and a research fellow at The Ohio State University Center for Cosmology and AstroPart...

Black hole artist’s concept. Credit: © nasa_gallery / Fotolia

A new study outlines how gravitational wave experiments could be used to test the existence of primordial black holes, gravity wells formed just moments after the Big Bang that some scientists have posited could be an explanation for dark matter. “We know very well that black holes can be formed by the collapse of large stars, or as we have seen recently, the merger of two neutron stars,” said Savvas Koushiappas, an associate professor of physics at Brown University and coauthor of the study with Avi Loeb from Harvard University. “But it’s been hypothesized that there could be black holes that formed in the very early universe before stars existed at all. That’s what we’re addressing with this work.”

The idea is that shortly af...

An image of the distribution of GRBs on the sky at a distance of 7 billion light years, centred on the newly discovered ring. The positions of the GRBs are marked by blue dots and the Milky Way is indicated for reference, running from left to right across the image. Credit: L. Balazs.

5 billion light years is a distance almost inconceivable, even on a cosmic scale ie 35,000 galaxies the size of our Milky Way are needed to cover that distance. Hungarian-U.S. team have now found a structure this big really exists in the observable universe.

The researchers found a ring of 9 gamma ray bursts (GRBs)—the most luminous events in the universe—5B light yrs in diameter, and having a nearly regular circular shape, with a 1 in 20,000 probability of the GRBs being in this distribution by chance...