Historical clue formulations

• Celestial omens, to some — 2025-09-04
• Space streakers — 2017-02-20
• "Dirty snowballs," to some astronomers — 2016-11-12
• Noted 1950s backup band — 2016-03-26
• 1950s backup group with four top 10 hits — 2013-05-10
• Their tails do not wag — 2008-06-20
• Bill Haley's band — 1995-01-17