[DB 1507 (35); OAB 54] It is true that the particles now causing meteor showers on Earth could not have been there 4.6 billion years ago and survived to the present day. However, meteor showers are known to be caused by large clusters of debris shed by comets, and are replenished by periodic comet flybys. For example, the well-known Perseid meteor shower, occuring every August, is known to be caused by debris from the comet Swift-Tuttle, and occurs every time the Earth passes through Swift-Tuttle's orbit. The shower is even observed to be more dense if the comet has passed by recently. This claim thus shifts to the survival of comets to the present day (See Maximum Life of Comets).