Supernovas as Endothermic Heat Sinks

Although extremely hot and bright, supernovas are most likely endothermic. The creation of a solar system pulls energy out of the environment. This energy is used to synthesize an abundance of heavy elements in the objects formed.

Supernova SN 1994D, lower left, outshines its home galaxy

By NASA/ESA, CC BY 3.0,
https://commons.wikimedia.org/w/index.php?curid=407520