FunTrivia Homepage New Questions Unanswered Post a Question Goto Qn # Archives

# What is "Hubble's Constant"?

Question #44023. Asked by peasypod. (Feb 03 04 11:49 PM)

Hamlet.

Hubble's law is the statement in astronomy that galaxies move away from each other, and that the velocity with which they recede is proportional to their distance.

It leads to the picture of an expanding universe and, by extrapolating back in time, to the Big Bang theory.

The law was first formulated by Edwin Hubble in 1929.

Hubble compared the distances to nearby galaxies to their redshift, found a linear relationship, and interpreted the redshift as caused by the receding velocity. His estimate of the proportionality constant, now known as Hubble's constant, was however off by a factor of about 10.

Furthermore, if one takes Hubble's original observations and then use the most accurate distances and velocities currently known, one ends up with a random scatter plot with no discernable relationship between redshift and velocity. Nevertheless the relationship was confirmed by observations after Hubble.

The law can be stated as follows: v = H0 D

where v is the receding velocity of a galaxy due to the expansion of the universe (typically measured in km/sec), H0 is Hubble's constant, and D is the current distance to the galaxy (measured in mega parsec Mpc).

http://www.nationmaster.com/encyclopedia/Hubbles-law

This time I didn't use my Physics Answer book...

 Feb 04 04, 6:36 PM

### Other Similar Questions & Answers

 When writing information on a CD, is it more efficient to use constant angular velocity or constant linear velocity?

### Suggested Related FunTrivia Quizzes - 90,000 currently online

1 The Constant
 This is the fifth episode of the fourth season. Here are some questions about this episode, some easy and some sort of hard.
LOST: Season 4 Tough
10 Q
nycdmc70
Mar 03 08
1164 plays
2 4.5 "The Constant"
 In this fascinating fifth episode of the fourth season, we learn more about one of the many mysteries of the island.
LOST: Season 4 Easy
10 Q
christopherm
Mar 03 08
1083 plays
3 4.5 "The Constant"
 All of these questions pertain to the episode titled, "The Constant", which was the fifth episode of season four. Good luck
LOST: Season 4 Average
10 Q
CAGuy0206
Jul 05 09
225 plays

"Ask FunTrivia" is for entertainment purposes only, and answers offered are unverified and unchecked by FunTrivia. We cannot guarantee the accuracy or veracity of ANY statement posted. Feel free to post an updated response if you feel that an answer is inadequate or incorrect. Please thoroughly research items where accuracy is important to you using multiple reliable sources. By accessing our website, you agree to be bound by our terms of service.