相对距离 [航][水运] relative distance
- 测量相对距离时,你需要比较星系的几个方法。
To measure relative distance, you need some way to compare galaxies. - 幸运的是,你的哈勃表需要的全部数据都是对星系的相对距离,而不是以光年或千米为单位的实际距离。
Fortunately, all you need for a simple Hubble diagram are relative distances to galaxies, not their actual distances measured in light-years or kilometers. - 我们不必考虑,它们的相对大小,因为从马斯登的计算中我们可以得知,就从我现在给你们演示的这种相对距离来说,这些电子将只是一些很微小的斑点。
And I don't have to worry about these relative dimensions because we know from Marsden's calculations that, on the length scale that I have shown here, these would be just tiny little dots.