About 170 million years later, the light emanating from the explosion was received by an arsenal of high-powered telescopes here at Earth. While the telescopes observed, a few of those stars ended their long lives in dramatic explosions. See what we learned: https://go.nasa.gov/2rcIaOr&h=AT2ywbQrtay_XNW6uqmtoFtsirkvbjLmDTujTtq_xSLbb5Zv35-yYMNggUGAGeOrvNTkmnQDXaS-y4T5sqr8vxCT60Lpu3j1rwY-qEARFY39zgc3Xdw0PWatcAK_tbES1tKmZHwX09jE5JS1aMv0OAVGcSNjhCPAXGIZuARevtmbcfHXkJ10lQ