twinkle
noun.
a rapid change in brightness; a brief spark or flash
noun.
merriment expressed by a brightness or gleam or animation of countenance
he had a sparkle in his eye|there's a perpetual twinkle in his eyes
Synonym: light, spark, sparkle
verb.
gleam or glow intermittently
The lights were flashing
Synonym: winkle, wink, flash, blink
verb.
emit or reflect light in a flickering manner
Does a constellation twinkle more brightly than a single star?