superstar

1. (corporate jargon) An exceptionally productive employee.Examples: "Want to hire a coding superstar? Call the agent."; "Is your organization looking for its next new hire, that superstar performer to take things to the next level? Be careful: Organizations are greater than just one individual. If you're that superstar, remember to be a good team player. You'll feel better about your job and you'll perform at an even higher level."; ""A superstar employee that is creating that toxic work environment is probably costing that company more than he or she is bringing in," Martin says."

2. (rare, astronomy) A giant star.Examples: "The greater an object's mass, the greater its gravitational force. If a star could attain a certain mass --- say a million to 100 million times the mass of our own sun --- then its gravity would become 100 times as powerful as the forces generated by the strongest known nuclear reactions. Such a super superstar, in a normal course of its evolution, would contract.."; "Toward the centre of the cluster, where they were more strongly congested, the whole region glowed as though as it were a monstrous superstar."; "Perhaps a supermassive cluster can coalesce to form a superstar -- a star with a mass of 1 million to 100 million solar masses."rare