The sun has unleashed the largest solar flares of 2013, firing off two major X-class flares in less than 24 hours. See how the solar storms stack up to history's worst solar flares.
It is one of several first for one Canadian astronaut and an all-time first for the space program.
Worldwide levels of carbon dioxide, the greenhouse gas affecting global warming, have hit their highest levels on record.

Two NASA astronauts will perform an emergency spacewalk to fix an ammonia leak on the International Space Station today (May 11). Here's how to watch it live.
NASA hopes the replacement of a pump module during an impromptu emergency spacewalk will eliminate an ammonia leak that forced flight controllers to shut down a solar array coolant loop aboard the In
The International Space Station is leaking vital ammonia coolant used to prevent the station's power systems from overheating, but it doesn't pose a danger to the crew, NASA announced Thursday (May 9
Today's 'ring of fire' solar eclipse won't just wow Australia's skywatchers. Hawaii and other Pacific regions will see a partial solar eclipse. How it works.
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