Spondylolysis is a break in the pars interarticularis. 脊椎滑脱是峡部连续性的中断。
By searching for a visible-light break, astronomers can identify distant galaxies without having to resort to tricky line-by-line redshift measurements. 天文学家藉由搜寻可见光波段处的中断,即可确认遥远的星系,而不需诉诸于难处理的逐一测量光谱线红移的方法。