A burnt-out star of enormous gravity and strange radio emissions, around which the Enterprise finds an ancient alien starship in Beyond the Farthest Star.
Questar M-17 is the dead star of the first Animated Series episode, Beyond the Farthest Star. The Enterprise is on a routine star-charting mission when it is pulled far off course by what Spock describes as hyper-gravity. The source is a dark, collapsed star giving off powerful radio signals, and the ship can only settle into orbit.
Already circling it is a huge and beautiful vessel made of pods spun like filaments. It was built by an insect-like people and has been dead for some three hundred million years. Its crew destroyed their own ship to keep a malevolent energy being trapped there.
The being moves into the Enterprise's computer and demands passage to the centre of the galaxy. Kirk shakes it off by slingshotting round the star, leaving it alone in orbit again.