In water photons travel at say 200,000km a second. Neutrinos travel at nearly 300,000km a second. That’s causes a blue glow. Which is how neutrino detectors work.

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pfdietz 10 minutes ago | parent | next [-]

> In water photons travel at say 200,000km a second.

It really depends on the energy of the photons. There is "dispersion". It's the same effect that causes a prism to split white light into different wavelengths.

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chinathrow 35 minutes ago | parent | prev [-]

Thanks - but I fell over this sentence:

> but there are other particles that don’t slow down as much and end up moving faster than light.

Not slowing down as much I can understand but shouldn't it read as

"but there are other particles that don’t slow down as much OR EVEN end up moving faster than light."

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chinathrow 34 minutes ago | parent [-]

EDIT:

Got it, faster than light IN THAT MEDIUM.

	▲	Betelbuddy 28 minutes ago \| parent [-]
		Yes ...it deserves to be flagged...This is the type of article we would never waste time with at the Vulcan Academy of Science. But you guys there at the Star Trek Academy, always had looser standards...