Massive Sunspot Could Pose Solar Flare Danger

NASA has warned that a huge solar flare now developing could cause
a dangerous solar storm that could disrupt electrical grids on Earth.
At present NASA is estimating a 15% chance that sunspot region
AR 1678 may generate an X-class solar flare as it rotates toward
Earth over the next 48 hours.

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NASA says 15% so it must really be a 99.9% chance