1) Main Types of Galaxies: 3;
- Irregular (Ellipticals and Irregulars exist in both normal and 'dwarf' sizes)
2) Number of Galaxies Visible: 100 billion
3) Most Abundant Type of Galaxy: Dwarf Ellipticals
4) Distribution of Normal Size Galaxies in Hubble Classification: Spiral-75%; Elliptical-20%; Irregular-5% (Edwin Hubble's data was skewed because spirals are generally brighter than any other galaxies, and he found more of them. Dwarfs are dim and were not found until bigger telescopes were built.)
5) Spiral Galaxy Nearest Our Milky Way Galaxy: Andromeda - 2.6 million light years away. (The Magellanic Clouds - dwarf irregulars--are only an average 200,000 light years away, but they are more giant star clusters than galaxies.) (See - Survey of Our Nearest Galaxies)
6) Distance of Visible Galaxies Furthest From Us: Appx. 14 billion light years.
7) Size of Typical Galaxy: 3,260 light years to 326,000 light years across.
8) Number of Stars in Average Galaxy: 40 billion
9) Number of Stars in Typical Large Galaxy (such as our Milky Way): 200 billion to 400 billion.
10) Number of Galaxies in Local Group: Appx: 40 (there may be dwarfs so dim we can't see them).
11) Largest Galaxy in Local Group: Andromeda
12) Smallest Galaxy in Local Group: Leo T, a dwarf irregular 600 light years across
13) Number of Galaxies in Average Galactic Group: <50
14) Fewest Number of Galaxies in Known Group: 4; Seyfert's Sextet in the constellation Serpens (in the photo it appears there are 6 galaxies, but closer study reveals that one is much farther way, and one is not a galaxy at all but a wisp of stars pulled from one of the other galaxies by gravitational forces).