There are at least 2 million galaxies in the COSMOS survey (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 COSMOS 1526561 galaxy (one of the galaxies in the COSMOS survey) is a spiral galaxy 7500 million light-years from Earth in the Sextans constellation, and is 100,000 light-years in diameter, and contains about 100 billion stars.
The COSMOS 2607238 galaxy (one of the galaxies in the COSMOS survey) is a barred spiral galaxy 6300 million light-years from Earth in the Sextans constellation, and is 100,000 light-years in diameter, and contains about 100 billion stars.
No. 'Cosmos' is another word for 'universe'. The cosmos contain millions of galaxies.
The COSMOS 397553 galaxy (one of the galaxies in the COSMOS survey) is a barred spiral galaxy 6000 million light-years (redshift of 0.66) from Earth in the Sextans constellation, and is 100,000 light-years in diameter (same size as the Milky Way), and contains about 100 billion stars (same number of stars as the Milky Way).
There are about 1011 (a 1, followed by 11 zeroes) galaxies in the known Universe. It is not currently known how much bigger the entire Universe is, compared to the known Universe.
The COSMOS 1177059 galaxy (one of the galaxies in the COSMOS survey) is an elliptical galaxy 7700 million light-years (redshift of 0.97) from Earth in the Sextans constellation, and is 60,000 light-years in diameter (about 1.7 times smaller than the Milky Way), and contains about 40 billion stars (40 percent of the Milky Way's stars).
The COSMOS 786560 galaxy (one of the galaxies in the COSMOS survey) is a spiral galaxy 6000 million light-years (redshift of 0.66) from Earth in the Sextans constellation, and is 120,000 light-years in diameter (1.2 times larger than the Milky Way), and contains about 200 billion stars (200 percent of the Milky Way's stars).
The COSMOS 781155 galaxy (one of the galaxies in the COSMOS survey) is a spiral galaxy 7000 million light-years (redshift of 0.83) from Earth in the Sextans constellation, and is 120,000 light-years in diameter (1.2 times larger than the Milky Way), and contains about 200 billion stars (200 percent of the Milky Way's stars).
The COSMOS 1161898 galaxy (one of the galaxies in the COSMOS survey) is a barred spiral galaxy 5300 million light-years (redshift of 0.54) from Earth in the Sextans constellation, and is 90,000 light-years in diameter (almost the same size as the Milky Way), and contains about 100 billion stars (the same number of stars as the Milky Way). It emitted its light 5300 million years ago, when the universe was 8400 million years old.
It will be impossible for the Sloan Digital Sky Survey to map and redshift all 100 billion galaxies in the observable universe.
No, because it will be impossible for astronomers to survey at least 100 billion galaxies (each with 100 billion stars) to make a 3D map of the observable universe.
The Fabric of the Cosmos has 569 pages.