What's happened to the sun? NASA animation shows breathtaking black hole slicing through sun

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NASA has revealed an animation of a massive dark patch stretching across the surface of the sun, creating a black hole-type illusion. 

The dark patches, otherwise known as a coronal hole, are areas in which the magnetic field has opened and allowed solar wind out. 

Space experts warned the phenomenon could impact satellites and the power grid, Mail Online reports. 

The coronal hole opened between January 2 and 5 this year.

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