cosmology

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…


Does dark matter exist? And how about gravity?

Erik Peter Verlinde (born 21 January 1962) is a Dutch theoretical physicist and string theorist. He is the identical twin brother of physicist Herman Verlinde. The Verlinde formula, which is important in conformal field theory…


Bouncing Bang

Cosmology has a problem. The problem begins, as the universe does, with the big bang. The standard cosmology imagines the universe’s first instant as a singularity: that is, a single point, taking up no space…


Eye of Horus in the distance

Light from a distant galaxy can be strongly bent by the gravitational influence of a foreground galaxy. That effect is called strong gravitational lensing. Normally a single galaxy is lensed at a time. The same…


Dark matters

ALL THAT WE KNOW of the universe we get from observing photons, Natarajan pointed out. But dark matter, which makes up 90 percent of the total mass in the universe, is called dark because it…


Keck spots a galaxy from the toddler universe

An international team of scientists has detected and confirmed the faintest early-Universe galaxy ever using the W. M. Keck Observatory on the summit on Maunakea, Hawaii. In addition to using the world’s most powerful telescope,…