Two weeks ago the sun emitted an electromagnetic pulse that would have caused a catastrophe on Earth had it struck us. But it passed through Earth’s orbit two weeks before we arrived at the point of intersection. Had it hit our planet, it would have destroyed hundreds of the massive transformers that our electric grids depend on. It is unknown how extensive the damage might have been had the pulse hit us, but if its greatest energy had struck the United States, larger areas of the country would have been left without power possibly for years, and the country as we now know it could have ended.
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Over the past 48 hours, the sun has exploded with no fewer than four x-class flares. X flares are the most powerful type of flare. Sunspot AR1748 has produced the flares. The latest X-flare from the sunspot occured on May 15th at 0152 UT. For four x-flares to take place over such a short period of time is highly unusual, and NASA is estimating that the sunspot has a 50% chance of generating more x-flares, and an 80% chance of generating smaller m-class flares. These flares are generating high levels of solar radiation, but so far, purely by chance, have not been directed at Earth.
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It’s happened before: In 1859, sunspots erupted, causing sparks in telegraph offices that set paper on fire. Today, 150 years later, we are much MORE "wired," and sun flares are much more dangerous.

Satellites would be disabled. GPS and radio signals would be scrambled. Electricity grids could burn out, plunging the areas where the flares hit into darkness. Depending on the amount of damage, these outages could last intermittently for years.
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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.

At present, the sunspot region is at least six times the size of Earth,
and is growing rapidly. It has developed what is known as a delta class
magnetic field, which is a type that can generate strong solar storms.
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