Charles Q. Choi
for National Geographic News
June 2, 2009
"The oldest of the subatomic particles called neutrinos might each encompass a space larger than thousands of galaxies, new simulations suggest."
[. . .]
"But over the roughly 13.7-billion-year lifetime of the cosmos, "relic" neutrinos have been stretched out by the expansion of the universe, enlarging the range in which each neutrino can exist."
It's a year old article but I just happened across it the other day. This is fascinating stuff, really. The idea that what might start out as a subatomic particle could, theoretically, become one of the largest single things in the universe.
It's no wonder I love this stuff.