A gravitational lens tripled the event in the night sky and helped astronomers measure the rate at which the universe is expanding.
Image: NASA, ESA, CSA, STScI, Brenda Frye , Rogier Windhorst , S. Cohen , Jordan C. J. D'Silva , Anton M. Koekemoer , Jake Summers
By bending the light from those farther-out—and thus, more ancient—sources, the gravitational lenses make those sources easier to see from Earth . This particular gravitational lens magnified a supernova—the brilliant explosion that marks the death of some stars—and multiplied it in the sky.The galaxy cluster is named PLCK G165.7+67.0, mercifully nicknamed G165.
Frye compared the supernova appearing three times to a person being seen from three different angles in a three-paneled vanity mirror. “In the trifold mirror analogy, a time-delay ensued in which the right-hand mirror depicted a person lifting a comb, the left-hand mirror showed hair being combed, and the middle mirror displayed the person putting down the comb,” Frye said. Though the supernova is visible in three spots simultaneously, that’s not always the case with such lensed objects.
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