cosmology

Old and Inactive (in the early universe)

An international team of astronomers has, for the first time, spotted a massive, inactive galaxy from a time when the Universe was only 1.65 billion years old. This rare discovery, made using the world-class W….


A heated and expanding debate

It was the early 1990s, and the Carnegie Observatories in Pasadena, California, had emptied out for the Christmas holiday. Wendy Freedman was toiling alone in the library on an immense and thorny problem: the expansion…


A Dark Energy Battle

Two decades ago, scientists found that the Universe’s expansion is accelerating. This was the complete opposite of what had been expected: the expansion should be slowing down due to gravity, not speeding up. At first,…


From soup to stars

Thanks to a new development in nuclear physics theory, scientists exploring expanding fireballs that mimic the early universe have new signs to look for as they map out the transition from primordial plasma to matter…


It came from another dimension

The article mentioned in this post can be found in the August 2014 edition of Scientific American, The Black Hole at the Beginning of Time by Niayesh Afshordi, Robert B. Mann and Razieh Pouhasan. If…


Young geezers in the sky

ESA’s Planck satellite has revealed that the first stars in the Universe started forming later than previous observations of the Cosmic Microwave Background indicated. This new analysis also shows that these stars were the only…


Finetuning the Hubble Constant

Astronomers think the universe might be expanding faster than expected. If true, it could reveal an extra wrinkle in our understanding of the universe, says Nobel Laureate Adam Riess of the Space Telescope Science Institute…