Communication via neutrino particles has some advantages over radio and optical signals.
Neutrinos are like electrons, but they don't have an electric charge and pass through most everything.
An advanced civilization could use neutrinos in several ways to communicate.
Extraterrestrials may have a better way to communicate across space than radio waves or optical beams. A team of scientists suggests ET could encode neutrinos, for example.
These particles of matter are similar to electrons, but since they have no electric charge, they can pass through anything. This makes them ideal for long-distance travel, as neutrinos are undisturbed by gas, dust and other matter that can block radio waves and other types of electromagnetic radiation.
Astronomers have been scouring the galaxy for decades for alien-produced radio signals -- and more recently for non-naturally occurring light pulses, as well -- to no avail.
"We really have no clue as to how some advanced civilization might want to transmit to us, nor do we have any really good idea why they would want to transmit to us," physicist John Learned, with the University of Hawaii, told Discovery News.