Ball decending toward home about 50 yds. away and about 50 ft. high..Son panicked and ran into house thinking it was a plane about to crash. No sound! Ball stopped and suddenly went from basketball size to tennis ball. It wobbled slowly to the east from its southern descent and went over the tree line and was gone. It did pulsate rather weakly when in its tennis ball configuration. Have one other unusual sighting but too lengthy to describe now.