should a plane weigh the same before and after the flight?
Jun 27, 2010 | 12:26 pm
#31
Join Date: Feb 2005
Location: Boulder, CO
Programs: UA, AA, WN; HH, MR, IHG
Posts: 7,055
You are mistaken. Photons have energy and momentum, but no mass. Neutrinos, however, are massive; the discovery is no longer so recent!
