With powerful stellar winds and blazing hot radiation, dozens of young stars have spent the last million years carving a vaguely heart-shaped bubble in surrounding clouds of interstellar dust — just in time for a sentient species to arise on a small planet 7,500 light years away, invent a celebration based on love and lots of chocolate, and develop the technology to look out into the cosmos and see a glowing red heart carved in a distant nebula.
