Who discovered universal expansion?

Answer 1

Hubble discovered expansion...sort of. He proposed it as a theory but it was a colleague who did the math and proved it. I can't remember the colleague's name.

Answer 2

distant galaxies, no longer gravitationally sure to our very own, in our team, are redshifted, this redshift is considered as direct evidence those galaxies are shifting removed from us. this suggestion is calculated into telling us the universe is increasing and at what value by using using Hubble's regulation. Coupled with different equations like the serious density calculation and the WMAP photograph of the homogenous, istropic distribution of the cosmic microwave historic past radiation, this turns into the spine for the evolution of the darkish potential concept. at present, we are finding to an previous thought, long abandoned, Einstein's 'Cosmological consistent' and attempting to restore it, at a factor in physics the place we comprehend, it may also have a place in our awareness of the universe yet.

Answer 3

How Fast is the Universe Expanding?

Historical Overview
In the 1920s, Edwin Hubble, using the newly constructed 100" telescope at Mount Wilson Observatory, detected variable stars in several nebulae. Nebulae are diffuse objects whose nature was a topic of heated debate in the astronomical community: were they interstellar clouds in our own Milky Way galaxy, or whole galaxies outside our galaxy? This was a difficult question to answer because it is notoriously difficult to measure the distance to most astronomical bodies since there is no point of reference for comparison. Hubble's discovery was revolutionary because these variable stars had a characteristic pattern resembling a class of stars called Cepheid variables. Earlier, Henrietta Levitt, part of a group of female astronomers working at Harvard College Observatory, had shown there was a tight correlation between the period of a Cepheid variable star and its luminosity (intrinsic brightness). By knowing the luminosity of a source it is possible to measure the distance to that source by measuring how bright it appears to us: the dimmer it appears the farther away it is. Thus, by measuring the period of these stars (and hence their luminosity) and their apparent brightness, Hubble was able to show that these nebula were not clouds within our own Galaxy, but were external galaxies far beyond the edge of our own Galaxy.

Hubble's second revolutionary discovery was based on comparing his measurements of the Cepheid-based galaxy distance determinations with measurements of the relative velocities of these galaxies. He showed that more distant galaxies were moving away from us more rapidly:

v = Hod

where v is the speed at which a galaxy moves away from us, and d is its distance. The constant of proportionality Ho is now called the Hubble constant. The common unit of velocity used to measure the speed of a galaxy is km/sec, while the most common unit of for measuring the distance to nearby galaxies is called the Megaparsec (Mpc) which is equal to 3.26 million light years or 30,800,000,000,000,000,000 km! Thus the units of the Hubble constant are (km/sec)/Mpc.
The universe was not static, but rather was expanding! This discovery marked the beginning of the modern age of cosmology. Today, Cepheid variables remain one of the best methods for measuring distances to galaxies and are vital to determining the expansion rate (the Hubble constant) and age of the universe.

Answer 4

Edwin Hubble...he was the first to notice that all of the galaxies were red-shifted per the Doppler effect---meaning that they were all moving away from us.

Answer 5

Yup, it was Edwin Hubble.

Answer 6

I believe Hubble was the first to measure and propose it.

Answer 7

IT WAS EDWIN HUBBLE.Miijimaste just wants best answer.