Tiny features of a ‘Big Bounce’ led to universe-size anomalies today
Read article: Microwave anomalies strengthen the case for loop quantum cosmology, say physicists
Debates over the shape of the Earth and the rate of the universe's expansion have a very different feel
Read article: A flat-Earth fight, an inconsistent Hubble constant, and carbon atoms at a graphene ‘watering hole’
Explore the latest issue of your favourite physics magazine
Read article: Hubble trouble, fighting ‘flat-Earthers’ and blue lasers for batteries: the July 2020 edition of Physics World is now out
Hybrid neutron stars could contain quark-matter cores
Read article: Gravitational waves from neutron-star mergers could reveal quark-gluon plasma
Ian Randall reviews At the Edge of Time: Exploring the Mysteries of Our Universe’s First Seconds by Dan Hooper
Read article: Duck, duck, goose?
The terahertz region of the electromagnetic spectrum is exploited less than its neighbouring wavelengths but plays a vital role in astronomy, as Sidney Perkowitz explains
Read article: Navigating the terahertz gap
The Physics World team takes a walk on the cold side in this week’s podcast
Read article: Cold atoms, a cosmic cold spot, and a tale of Cold War espionage
Why does the cosmic microwave background have a strange patch that is much colder than expected? Syed Faisal ur Rahman looks at some possible explanations
Read article: The enduring enigma of the cosmic cold spot
New measurement of universe’s expansion is in conflict with Big Bang yardstick
Read article: Cosmic clash over Hubble constant shows no sign of abating
Objects travelling at relativistic speeds will shorten as a consequence of Einstein's special relativity. But what, asks David Appell, if you try to look at such an object?
Read article: The invisibility of length contraction
