From G. ALDERSLADE
Your article on Supernova 1987A claims that we now have proof that neutrinos
must have a lifetime of over 170 000 years, since they have arrived on Earth
from that event (‘Happy Birthday, Supernova 1987A’, 22 February). But they
were travelling at the speed of light, so wouldn’t their internal clocks
indicate the passage of zero time, proving only that their lives are greater
than instantaneous?
G. Alderslade Billingham, Cleveland
