Celestial omens, to some

COMETS

Think of bright streaks in the night sky often named after their discoverers, historically seen as harbingers of change or doom.

Celestial omens" refers to signs in the sky that some cultures historically viewed as prophecies or warnings—like comets, which were often seen as harbingers of change or doom. The clue plays on the idea that "to some" (certain belief systems or ancient societies) comets held supernatural meaning. The answer is straightforward: COMETS fit both the literal definition of celestial objects and the cultural association with omens.