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(NBC) -- A massive formation on the sun made of super-hot magnetic plasma erupted this week in an explosive solar storm captured on video by NASA spacecraft.

The huge plasma tendril, known as a solar filament, erupted on Wednesday, blowing part of itself out into space in what astronomers call a coronal mass ejection, or CME. NASA's powerful Solar Dynamics Observatory recorded video of the solar filament eruption while the Solar and Heliospheric Observatory tracked the subsequent CME.

Astronomer Tony Phillips of SpaceWeather.com, a website that tracks solar flare events, wrote in a post Thursday that amateur and professional astronomers had watched the filament for more than a week to see how it would meet its end.

"Astronomers had been bracing for the possibility that the filament would collapse, causing a Hyder flare when it landed on the solar surface," he wrote. "Instead, it erupted and hurled part of itself into space."

Phillips said the solar eruption was not aimed directly at Earth, but could deal a "glancing blow" to the planet's magnetic field on Saturday, possibly amplifying auroral displays.

The most powerful solar eruptions can pose a danger to astronauts and spacecraft in space, and can interrupt satellite navigation and communications systems. They can also interfere with ground-based power grids. Last year, the sun passed the peak period in its current activity cycle.

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