Atomic explosion

South Korean residents living in Japan offer prayers in front of the cenotaph for Korean atomic bomb victims at Hiroshima Peace Memorial Park in Hiroshima, western Japan,. Hiroshima marks the 75th anniversary of the world's first atomic bombing on Aug. 6.

Photo by AP/PTI Photo

This July 16, 1945, file photo, shows an aerial view after the first atomic explosion at Trinity Test Site, N.M. Western governors say atmospheric nuclear weapons testing exposed more states and more people to radiation fallout and resulting cancers and other diseases than the federal government recognizes. The Western Governors' Association sent letters to the U.S. Senate and U.S. House urging passage of proposed changes to a law involving "downwinders" that would add all of Nevada, Arizona and Utah, and include for the first time downwinders in Colorado, Idaho, Montana, New Mexico and the island territory of Guam.