Dust particles in the air scatter incoming radiation from the sun. Speckle also occurs if multiple parts of a coherent wave scatter from different centers. The particles scatter the light with a Doppler shift. The Lunar Modules made no blast craters or any sign of dust scatter. The particles created by the field scatter in all directions with equal amplitude. Neutrons can elastically scatter off nuclei, causing the struck nucleus to recoil. Depending on edge imperfections this can directly scatter light into the cavity. Electrons scatter from all of these, resulting in resistance to their flow. The remaining isotopes will simply scatter the neutron, and have a "scatter cross section". Without a magnetic field, electrons scatter in this region. Scatter them abroad, take away their strength. These then scatter into millions of tiny blades. No permit is required to scatter ashes at sea. However, their rings will scatter, blink, and disappear if they are not re-collected quickly enough. They thereby scatter visible light, making PS-I opaque.