The parent body of the Leonids meteor shower, Comet Tempel-Tuttle, leaves a trail of expelled sand-size particles every 33 years when it returns to the inner Solar System.

• 狮子座流星雨的母体就是每33年回归太阳系一次的坦普尔-塔尔特彗星喷射出的沙状微粒所留下的遗迹。