Hawaii State Governor David Ige said the new siren test will ensure the public knows what they should do in case of an imminent attack days after North Korea fired a powerful nuclear-capable intercontinental ballistic missile.
Russian state weather service Roshydromet said it had found “extremely high pollution” of ruthenium 106 in samples from two meteorological stations in the southern Urals region in late September and early October.
Scientists unveiled the Parker Solar Probe at a laboratory in Laurel, Maryland, on Monday where the spacecraft is being prepared to make an unprecedented plunge into the sun's atmosphere.
The surface of Mars contains compounds that are too toxic to sustain the most basic form of life, according to a study by the University of Edinburgh's School of Physics and Astronomy.
In the early hours of April 26, 1986, a botched test at the Chernobyl nuclear plant in former Soviet Ukraine triggered a meltdown, ultimately killing and displacing thousands.
After travelling 6 billion kilometres across space over 12 years, Rosetta ends historic mission by crash-landing into the comet it orbited for two years.
Japan has seen growing opposition to nuclear plants after the Fukushima accident in 2011. After the closure of many reactors by court orders, the country has now just three operating nuclear power plants.
Thousands of people died instantly after the US dropped an atomic bomb on Nagasaki on August 9, 1945. The attack came just three days after the US dropped the first-ever atomic bomb on Hiroshima.
How the nuclear bombing of Japan's Hiroshima and Nagasaki by the United States at the end of World War II dictated each nation's relationship with radiation in their stories for years to come.
The spacecraft is expected to orbit the solar system's largest planet 37 times in a bid to unravel its mysteries before it heads into a programmed path of self-destruction in 2018.
Ukraine marks 30 years since the world's worst nuclear accident that killed thousands in Chernobyl.
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