 That caused 20 of these spacecraft to deorbit among the many thousands that Elon Musk and SpaceX has there. But their little acronym, RUD, translates in their world to called Rapid Unchecked Disassembly of the Loss of Those Particular Spacecraft. But George, we go deeper out into the cosmos, and here we go. Dark matter, many people believe, may only be 20% of the universe, its constituencies.