The Hubble tension is one of the biggest issues in modern cosmology. Why can we not agree on the expansion rate of the Universe? Today’s authors propose a solution: The actual disagreement might be in the assumed mean temperature of the cosmic microwave background.
Modern cosmology relies on large numerical simulations. However, creating them requires a lot of memory and computational time. Today’s paper describes a technique that can dramatically decrease the computational cost of simulations – by focusing on the most important parts of the simulation and reducing waste!
Interstellar travel is difficult with traditional fuel-powered rockets. Today’s paper explores how we could instead use sailing space ships, propelled by photons and particles from astrophysical sources. Spoiler alert: Sailing ships could almost reach the speed of light!
The Hubble constant describes the rate at which the universe expands. But different measurements of it yield different results – a problem for the cosmic standard model. Today’s paper discusses new Cepheid observations, which increase the problem – so, are we on the brink of new physics?