The size of the space taken up by a proton’s mass has been measured, and it’s much smaller than previously thought. go.nature.com/40uTX9H

Nature research paper: Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater go.nature.com/3KjZxGj

For the first time, astronomers have witnessed a planet being swallowed by its dying sun, reports Becky Ferreira for The New York Times. The star engulfed the planet while swelling into a red giant hundreds of times its previous size. nytimes.com/2023/05/03/sci…

The Arctic Ocean will lose all summer sea ice in the coming decades, even if humans drastically cut carbon emissions. go.nature.com/3MTgCXJ