I never said pulsars were the same thing as qarsaus and of course twinkling has to occur far outside our solar system since the stars are outside our solar system. Even our own sun sends up flares and varies it's luminosity and as it could appear perhaps from far far away a twinkling, if it could be observed from afar.A quasar is light from the center of a galaxy and can be reflected from another galaxy. Light echos are light from novas reflected on stars from different angles.