Sense Sonnet - Chiller

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The "green" comet is coming back,

Close enough to Earth to be seen.

It has a quite long orbit track

Around the sun and appears green.

Experts say that it last did show

When we were still in the Stone Age

Some fifty thousand years ago,

Early evolving human stage.

Perhaps this "green" comet will find

That we have not evolved too well,

And so will zap all humankind

Back into the cave life to dwell,

Hoping on next orbit revolved,

Humans will have better evolved.