# Supernovae Get Blamed for Galaxy's 2-Million-MPH Speeding Ticket - Date: 2026-03-31 - Category: Space & Aerospace XRISM clocked M82s hot wind at over 2 million miles per hour and found that supernovae, not cosmic rays, do the driving. Sixty percent of every blasts energy goes into the wind. Three solar masses per year still go missing. ---