因为我们看到的它还处于早期，这个结果表明螺旋星系主盘开始时有着很大的金属丰度梯度。

Because we see the galaxy when it was young, this result suggests spiral discs start off with steep metallicity gradients.

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Benson说，这个高梯度的结果与一个久已有之但一直未被证实的想法相符，这个想法就是螺旋星系的恒星主盘是由内而外形成的。

Benson says that the steep metallicity gradient agrees with the long-standing but unconfirmed idea that spiral galaxies form their discs of stars from the inside out.

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