Supernova

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 456.6 Hz, 64 cents sharp of A4, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it for a flash and a blast that blows the glowing shell apart.

A supernova is the explosion of a star, one of the biggest blasts in the universe. For a few weeks one exploding star can shine brighter than a whole galaxy of billions of stars. It throws the star's gas out into space as a glowing, spreading shell.

Tap it and the core flashes and the shell flies apart in chunks that fade, then it glows back in place. Supernovas spread elements such as iron into space, where they end up in new stars and planets, and even in the blood in your body. People saw one in the year 1054; its remains are the Crab Nebula.

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