scintillate

Short definition from Wiktionary

Verb

1. 1
   To give off sparks; to shine as if emanating sparks; to twinkle or glow.
2. 2
   Of a star or other celestial body: to vary rapidly in brightness; to twinkle.
3. 3
   Especially of a phosphor: to emit a flash of light upon absorbing ionizing radiation.
4. 4
   To dazzle or to impress.
5. 5
   To throw off like sparks.