ultraheavy

But concentrating enough energy to create the ultraheavy ghosts believed to exist will require a mammoth machine, a multibillion-dollar investment.

"Like ultraheavy patrol craft."

According to theory, Dr. Woosley said, the neutrino pulse implied that at the heart of the supernova, an ultraheavy remnant had been created, a neutron star.

The rare isotope einsteinium-254 is favored for production of ultraheavy elements because of its large mass, relatively long half-life of 270 days, and availability in significant amounts of several micrograms.