Astronomy
Constraining neutrino mass from large-scale structure surveys
Quick fact
Neutrinos are so light that their masses were only confirmed in 1998 via neutrino oscillations, but cosmologists can now estimate their total mass by looking at how galaxies are spread out in the universe.
Why this is interesting
We know neutrinos have mass, but they're so light that no one can weigh them directly. How can measuring the arrangement of galaxies across billions of light-years help?