Scientists Startled by Discovery of Small Star Swimming Through Outer Layers of Another Larger Star

A team of researchers in China have discovered a stunning binary system in which a stellar object known as a pulsar orbited inside the outer layers of its companion star — which it accomplished after stripping its host's innards and dispersing them into space. The findings, detailed in a new study published in the journal Science, are an incredibly rare example of a "spider star" that preys on its companion, so-named because of the female arachnids that devour males after mating. And tantalizingly, the grisly scene is some of the best evidence yet of a stage of stellar evolution called the common envelope phase, which has never been directly observed by astronomers. Pulsars are rapidly spinning neutron stars, the incredibly dense stellar cores that are left over in the aftermath of a supernova. Everything about neutron stars exhaust superlatives — their gravity most of all. They are so tightly packed, containing more mass than our Sun inside a form just a dozen miles in radius, that ... Read full article.