How large is the Flame Nebula physically, compared to its apparent angular size in the sky?

Answer

Its actual physical size is estimated around 4 light-years across, while its angular size is less than one degree.

The nebula appears small visually, spanning less than a degree across the sky, but its actual structure is immense, estimated at about 4 light-years in diameter.

How large is the Flame Nebula physically, compared to its apparent angular size in the sky?
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