They are literally "uncountable"; every time we improve the telescope, we see more and more galaxies.
1 inch
it is 1 mile long
There are at least 3000 galaxies in the Hubble Deep Field North (with billions of stars, planets, and moons in each one; as well as asteroids and nebulae). Their light has taken 13 billion years to reach Earth.
The Hubble Space Telescope was named after American astronomer Edwin Hubble, who made significant contributions to the field of observational cosmology. Hubble is best known for demonstrating the expansion of the universe through his observations of galaxies moving away from Earth.
the hubble telescope edwin hubble :)
what is the type of star used by the Hubble to measure the distance to other galaxies.
Edwin Hubble proved that there are other galaxies spread throughout the universe, and that these galaxies move away from each other as the universe expands. He further found that the galaxies in the outermost areas of the universe move faster that those nearer the middle, a feature in his Hubble's Law.
The Hubble Ultra Deep Field is a million second exposure into an area of the universe revealing numerous galaxies as far away as 13.7 billion light-years. By our reckoning, it is within a few hundred million years of the origins of the universe. But since the light took that long to get here, we have very little idea where the galaxies actually are right now in time.
Hubble.
Edwin Hubble used Cepheid variable stars to measure the distances to galaxies. These stars have a relationship between their luminosity and pulsation period, allowing astronomers to calculate their distance based on their observed brightness.
It would take at least 1,000,000 years for the Hubble Space Telescope to observe over the entire sky of 100 billion galaxies in the universe.
Hubble, in his studies of Nebulas which turned out to be galaxies.