Do neutrinos have mass?

Question

(answer my other questions)

Answer 1

That is one of the most important questions.  Neutrinos travel at almost the speed of light (if they have no mass then they do travel at the speed of light).  

Physicists think that there may be some mass.  The reason for this is there is a discrepancy between the time the light from a supernova reached earth and the time we measured an influx of neutrinos.  Since the neutrinos arrived after the light (a few milliseconds) physicists think that neutrinos do not travel at the speed of light and thus have a mass.  If infact neutrinos have a mass, they may be 'dark matter', or could be enough to gravitationally close the universe.

Cool, eh?

Hope this helps =)

Answer 2

Yes, but it is extremely minuscule. Neutrinos are capable of passing through solid objects without disintegrating.

Answer 3

yes, but it contains very minute fracture of mass