What was startling about the galaxy GN-z11 regarding its characteristics for such an early object?

Answer

It was surprisingly bright and actively forming stars

While the immense distance of GN-z11 was significant, its observed properties were equally surprising to astronomers modeling early cosmic evolution. The galaxy was found to be shining with the light equivalent to about 100 million suns, meaning it was much more luminous than theoretical models predicted for a galaxy existing just 400 million years after the Big Bang. Furthermore, it appeared to be undergoing a vigorous, intense rate of star formation relative to its mass. This unexpected brightness and high star production rate challenged existing expectations about the pace at which galactic structure and stellar nurseries developed in the very early universe.

What was startling about the galaxy GN-z11 regarding its characteristics for such an early object?

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