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Comment Re:why 10 years? (Score 3, Informative) 20

Supernovae are transient events. So it will fade. 10 years from now, the light will reach us again, after it's travelled a different route. RTFS, it's right there:

"The supernova will appear again in the next 10 years, as its light takes different paths around and through the gravitational lens."

In other words, some of light got lensed into taking the scenic route, and will show up later.

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