I'd bet, as you describe it like a streak of smoke, on the meteor. The rainbow effect could be either your eyes giving an afterglow effect from something very bright or from moisture or even dust in the air between you & the object.
Was there a noise? If meteors are close you can hear them - they travel faster than sound & so there's the sonic boom as well as a high-pitched whistling noise.
When in doubt, stick with the mundane - mostly you'll be right.
Never doubt there is Truth, just doubt that you have it!
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