That is, unless you experience flashers or other eye problems.

When seen in real time, it looks like flickering.

When neutrinos interact with electrons or nuclei of those water or oil molecules, they give off a flash of light that sensors can detect.

This "green flash, " caused by light refracting in the atmosphere, is rarely seen.

They also think they can explain the bright flash seen from Earth earlier this month: it was a meteor, though a small one that didn' t get very far.