The mega sunspot group that pummelled Earth with solar radiation earlier this month is ... scientists are tracking the sunspots, and a map available on spaceweather.com suggests AR3664 was the ...

Have you ever wondered how astronomers manage to map out the Milky Way when it's so incredibly vast? One of the most powerful tools is something called 21 cm radiation. Hydrogen, the most abundant ...

radiation from a supernova—either in the Scorpius-Centaurus group (460 light-years away) or the Tucana-Horologium group (230 light-years away)—began bathing Earth in radiation for roughly ...