Omphales

Omphales are a proposed class of astronomical objects that are theorized to be remnants of a specific type of supernova explosion. The term "omphale" is derived from the Greek word for navel, suggesting a central, condensed core. These objects are thought to form when the core of a massive star collapses, but instead of undergoing a complete supernova, it's hypothesized that a portion of the star's outer layers accretes back onto the core, creating a compact and extremely dense object.

The theoretical formation of omphales is linked to a failed supernova scenario or a peculiar type of stellar explosion. Unlike neutron stars or black holes, which are standard end-states of massive stars, omphales would possess unique properties. Their density is expected to be significantly higher than that of neutron stars, potentially approaching or exceeding the density of nuclear matter. This extreme density is a key characteristic distinguishing them from other known compact objects.

The existence of omphales remains hypothetical, and no observational evidence has definitively confirmed their presence in the universe. Researchers are exploring potential observational signatures that might distinguish omphales from other astronomical phenomena. These could include specific spectral characteristics or gravitational wave signals that differ from those produced by known objects like black holes or neutron stars. Further theoretical work and advancements in observational astronomy are needed to either confirm or refute the existence of omphales.