is.audio.volume = 0.15;
                this.isPlaying = false;
                this.currentTrack = '';
                
                this.tracks = [
                    'alpha_centauri.mp3', 'andromeda_galaxy.mp3', 'betelgeuse_supergiant.mp3',
                    'cassiopeia_constellation.mp3', 'crab_nebula.mp3', 'eagle_nebula.mp3',
                    'horsehead_nebula.mp3', 'orion_nebula.mp3', 'proxima_centauri.mp3',
                    'sagittarius_a_star.mp3', 'vega.mp3'
                ];
         