哈勃定律与哈勃常数

Hubble's Law and Hubble Constant

美国天文学家哈勃（E．P．Hubble）在星系天文领域做出了一系列杰出的贡献．他第一个证实了河外星系的存在，率先对星系按外观形态进行了科学的分类，并通过实测发现了以他姓氏命名的哈勃定律。

American astronomer E.Hubble made brilliant contributions to the field of galaxy astronomy which include affirmation of the existence of external galaxies and their classification according to their morphology for the first time,and discovery of the important Hubble's law.