Hidden monster or spooky cosmological coincidence?
Two binary black hole mergers were detected within 20 minutes of each other. But does this mean that there were four black holes… or just two?
(s)Pinning down the origins of black hole mergers
All of the black hole mergers we’ve seen so far with LIGO/Virgo have surprised us with their mass-spin relationship. Are we misunderstanding stellar collapse? Or is there something even more exotic going on?
Growing once, growing twice … or three times?
As the Hubble tension continues to bubble, can an extra phase of expansion set right our understanding of the Universe’s history?
BepiColombo blasts off in pursuit of Einstein
A joint European and Japanese mission to Mercury sets off to answer questions about the planet’s geology, magnetosphere, and to try and prove Einstein wrong.
Zoos, Swamplands and Cosmology
Is string theory compatible with observational data? Today’s paper looks at how avoiding the swampland of unsuccessful string theories can mean violating reliable constraints on cosmological quantities.