The great spirals... apparently lie outside our stellar system.
大螺旋……显然在我们的恒星系统之外。
-- Edwin Powell Hubble 哈勃
The great spirals... apparently lie outside our stellar system.
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The great spirals... apparently lie outside our stellar system.
大螺旋……显然在我们的恒星系统之外。
-- Edwin Powell Hubble 哈勃
