Read article: Navigating the terahertz gap
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: Cold atoms, a cosmic cold spot, and a tale of Cold War espionage
The Physics World team takes a walk on the cold side in this week’s podcast
Read article: The enduring enigma of the cosmic cold spot
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: Cosmic clash over Hubble constant shows no sign of abating
New measurement of universe’s expansion is in conflict with Big Bang yardstick
Read article: The invisibility of length contraction
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: Big questions in astronomy and debating the value of an LHC successor
Cosmologist Jo Dunkley discusses her new book Our Universe: an Astronomer’s Guide
Read article: Pondering the meaning of time and creating black hole analogues
Journalists discuss a physics-inspired art exhibit and the week’s research highlights
Read article: Physicists stimulate Hawking radiation from optical analogue of a black hole
Experiment is a “milestone” towards seeing the spontaneous emission of Hawking radiation from a lab-based analogue, but questions still remain
Read article: Our universe has antimatter partner on the other side of the Big Bang, say physicists
An “antiuniverse” where time runs backwards and antimatter dominates would naturally explain the existence of dark matter
Read article: Benchtop cosmology exploits solid-state systems
Weyl metals and all their fascinating phenomena are not the only systems for cosmological simulations
