Simeis 147: Supernova Remnant . ... Credit Copyright: Rogelio Bernal Andreo (Deep Sky Colors) Explanation: It's easy to get lost following the intricate filaments in this detailed mosaic image of faint supernova remnant Simeis 147 (S147). ... That's about 150 light-years at the stellar debris cloud's estimated distance of 3,000 light-years. ... The supernova remnant has an estimated age of about 40,000 years, meaning light from the massive stellar explosion first reached Earth 40,000 years ago. ...