starburst

Concise Oxford English Dictionary © 2008 Oxford University Press:
starburst/ˈstɑːbɜːst/

▶noun

• 1 a pattern of lines or rays radiating from a central point.

  ■ an explosion producing such an effect.

  ■ a camera lens attachment that produces such a pattern.

• 2 Astronomy an intense episode of star formation.