ヘール・ボップ彗星
On March 19–20, 1997, Marshall Applewhite taped himself in "Do's Final Exit", speaking of mass suicide and "the only way to evacuate this Earth". After asserting that a spacecraft was trailing Comet Hale–Bopp and that this event would represent the "closure to Heaven's Gate", Applewhite persuaded 38 followers to prepare for ritual suicide so their souls could board the supposed craft. Applewhite believed that after their deaths an unidentified flying object (UFO) would take their souls to another "level of existence above human", which he described as being both physical and spiritual. Their preparations included each member's videotaping a farewell message.