Why is the use of Hubble's Law to measure distances to galaxies so important to astronomers?
A) They have NO other way of measuring distances to galaxies - absolutely none
B) Many galaxies don't move away from us, so when we find one that does, it's really a big deal
C) Most galaxies are so far away, the only way to get distances to them is to use Hubble's Law
D) The other ways of getting distances only work for really far away galaxies; so the Hubble Law is the only way to measure distances to nearby galaxies
E) It's stretching the truth to say that Hubble's Law is a really important way to get distances to galaxies; really, it's no more important than any other method

Question

Quizplus · Accepted Answer

Most galaxies are so far away that the only practical way to measure their distances is to use Hubble's Law. Other methods, such as parallax or standard candles, only work for nearby galaxies. Hubble's Law is a fundamental tool in measuring the expansion of the universe and the large-scale structure of the cosmos.

Why Is the Use of Hubble's Law to Measure Distances