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Renaissance astronomer Tycho Brahe's lab is home to a centuries-old chemical mystery
By Elizabeth Howell published
A chemical mystery lurks in the laboratory of Tycho Brahe, one of the most famous astronomers of all time. Scientists found tungsten in Brahe's lab, and they're not sure how it got there.
These 17th-century drawings of the sun by Kepler add fire to solar cycle mystery
By Elizabeth Howell published
Earth was cooler than usual in the 16th and 17th centuries and scientists are still trying to figure out why. New analysis of sunspot drawings by Kepler, in 1607, may shed some light.
Watch a colossal X-class solar flare erupt from Earth-facing sunspot (video)
By Daisy Dobrijevic published
An X-flare erupted from the sun at 10:33 p.m. EDT on July 28 (0233 GMT July 29). Watch the action unfold here.
Sun blasts out most powerful flare of current solar cycle, sends massive coronal mass ejection into space (video)
By Meredith Garofalo published
A solar flare on July 23 was even bigger than a previous one that triggered May's global aurora storm, but this one was facing away from Earth on the far side of the sun.
These 2 US cities are the most vulnerable to solar storms, scientists say
By Stefanie Waldek published
Geomagnetic storm-induced blackouts may be looming.
Aurora alert: Possible geomagnetic storm could bring northern lights as far south as New York
By Daisy Dobrijevic last updated
Northern lights could be visible over some northern and upper Midwest states on July 24. A geomagnetic storm watch has been issued by NOAA's Space Weather Prediction Center.
Watch two plumes of 'dark' plasma explode from the sun and send solar storm towards Earth (video)
By Meredith Garofalo published
Two loops of "dark" plasma exploded from the sun on July 21, sending a stream of plasma and magnetic field known as a coronal mass ejection barreling towards Earth.
Solar storm forecasts could soon get a big boost. Here's how.
By Meredith Garofalo published
Scientists have figured out a way to estimate the speed of a coronal mass ejection before it even leaves the sun, potentially providing a big boost to space weather forecasts.
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