Hubble Law
In 1929 Edwin Hubble published his landmark discovery that distant spiral 'nebulae' are receding from us at speeds proportional to their distances, implying that the Universe is expanding at a constant rate.
The Hubble Law
Now let's return to the discussion of the astronomer Hubble. Hubble, you will recall, determined the distance to the Andromeda galaxy by finding a Cepheid variable star there.
HUBBLE LAW
The linear relationship between the distance of a galaxy (D) and its cosmological recessional velocity (V); V = HxD, where H is Hubble's constant.
Hubble law: The linear relation between the distance to a galaxy and its apparent radial velocity.
Hubble time: An upper limit on the age of the universe derived from the Hubble constant.
Hubble Law
(a) The law that recessional speed is proportional to distance for a homogeneous and isotropic universe. Galaxies moving away from us with a speed precisely following this law are said to follow the Hubble flow.
Hubble law - (n.)
The linear relation between the velocity of recession of a distant object and its distance from us, v = H0d.
human genome project - (n.) ...
The Hubble law is satisfied exactly for "distance now", or metric radial distance.
The Hubble law relates a galaxy's recession (expansion) speed with its distance: speed = Ho × distance. Measuring the speed from the redshift is easy, but measuring the distance is not.
What makes Hubble Law such an important discovery?
What does the value of the Hubble Constant tell us?
What are the characteristics of the various types of active galaxies - BL Lac, Seyferts, Radio Galaxies?
Bulk motions of distant galaxies deviating from the Hubble flow. see Hubble Law [LB90]
Larmor Frequency ...
According to this law, known as the Hubble law, the greater the distance of a galaxy, the faster it recedes.
Applying the Hubble law (with our adopted value of the Hubble constant H0 = 65 km/s/Mpc), we obtain distances of 660 Mpc for 3C 273 and 1340 Mpc for 3C 48.
This situation is analogous to Hubble law's. Astronomers can estimate how fast our Milky Way galaxy and, say, the galaxy M100 are traveling away from each other, as well as the distance between them.
It should be noted that, on very large scales, Einstein's theory predicts departures from a strictly linear Hubble law. The amount of departure, and the type, depends on the value of the total mass of the universe.
In 1927, the Belgian Catholic priest Georges Lemaître proposed an expanding model for the universe to explain the observed redshifts of spiral nebulae and forecast the Hubble law.
Putting it all together now, if the object is moving away from us at 3000 km/sec, its distance from us (according to the Hubble Law) is
d = v/Ho = 3000/65 = 46 Mpc or 1.4 x 108 light-years
Activity 2: A Keck Spectrum ...
Lecture 13: Galaxies and the Hubble Law
Here are some learning goals for the study of galaxies: ...
 See also: Distance, Galaxies, Galaxy, Universe, Light
  
|
RSS
