You miss the point. They're not coming here- they're spiralling in
circles about the size of the solar system, 150,000 light-years from
here. They will eventually drift throughout the galaxy, but on a
timescale thousands of times larger than a direct path would take.
Horace Heffner wrote:
On Mar 16, 2006, at 6:18 PM, Bob Fickle wrote:
A 100 GeV charged particle (electron OR proton) has a radius of
curvature in the galactic field (1 microgauss avgerage) of about 3
billion km (3 light-hours). No way they're crossing galactic
distances anytime soon- probably billions, rather than millions, of
years..
They only have to go 150,000 ly. Don't forget, the photons left
150,000 years ago. The electrons are right behind. In other words,
(1-0.99999999)*150000y = 0.0015 year = 0.5481 days
Fred's making sense to me. What's a few extra hours for curvature?
Horace Heffner
