Hey, Do physicists have any idea about any of the theorized 'graviton's' properties? spin charge rest mass wave length anything? As far I know (which is very little) the only thing we know is Gravity's strength relative to the other 3 forces. P.S. Why was LISA's three arms set at 5 million km apart? Surely this must have been based on some expected value for probability of detection? Otherwise, why not set them 1 million km apart.