An explosive new study has found that nearly 60 years after nuclear tests were performed in the Pacific Ocean, radioactive chlorine is still leaking from ice sheets in Antarctica. The research says ...

chlorine-36, which has a half-life of only 300,000 years, in the early solar system. The solar system’s chlorine-36 could have formed in two different ways — either ...

Clear evidence in a Chinese meteorite for the past presence of chlorine-36, a short-lived radioactive isotope, lends further support to the controversial concept that a nearby supernova blast was ...