Hubble(99年)公布了遥远的星系退行速度正比于它们到我们的距离的划时代观测事实。
Hubble (99) published the epochal observational fact that the receding speed of galaxies is proportional to their distances away from us.
Hubble(99年)公布了遥远的星系退行速度正比于它们到我们的距离的划时代观测事实。
Hubble (99) published the epochal observational fact that the receding speed of galaxies is proportional to their distances away from us.
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