Nebula

Tap it to light new stars in the clouds. Pick its colors in the Splash tab.

A nebula is a huge cloud of gas and dust in space. In some, gravity pulls the gas into clumps that heat up and become new stars, so they are called star nurseries. The young, hot stars light up the gas around them so it glows. Tall pillars of dust, like the famous Pillars of Creation in the Eagle Nebula, are places where stars are forming.

Tap it to light seven new stars, one after another, three at the tips of the pillars: each flares up with spikes and settles to a bright point in a glow of lit gas, then later fades. Pick its colors in the Splash tab.

This link opens it in the Playground. To put it on your own page, add the element and one script tag. Every option.