What cosmic timescales does the formation of the Stingray Nebula allow astronomers to observe in real time?

Answer

The immediate aftermath of stellar death

Because its formation is so recent (within about 150 years), the Stingray Nebula provides an unparalleled opportunity to study the immediate, dynamic aftermath of a star's final mass ejection events.

What cosmic timescales does the formation of the Stingray Nebula allow astronomers to observe in real time?
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