Scientists discover supernova iron on moon
German physicists have discovered supernova iron on the moon, confirming that a supernova explosion once took place near our solar system. They found an unusually high concentration of the radioactive 60Fe isotope, created in supernova explosions, in lunar ground samples gathered between 1969 and 1972. Further, the samples indicate that the supernova explosion occurred about 300 light-years away.