NASA recently had the opportunity to study “star guts” when the Hubble Space Telescope turned its eyes on Supernova 1987A. Supernova 1987A is located on the outskirts of the Tarantula Nebula in the Large Magellanic Cloud around 150,000 light-years away from Earth. Experts note an interesting string-of-pearls formation at the center of this image. As Space.com reports, “The glowing ring of gas that measures 6 trillion miles in diameter encircles the supernova remnant and is energized by X-rays. These pearls of circumstellar material are made up of material that was emitted before the star exploded, as it was preparing to die.