Lab 11: Galaxies and Clusters of Galaxies
Part 1- Galaxy Classification:
The method of classifying galaxies devised by Hubble is called the __________ __________ __________.
2 Major Classifications of Galaxies:
- Elliptical (E): Have a ______________distribution with a [DEFINITE/ NOT DEFINITE] structure.
- Spiral (S): Have a _______________ distribution with a [DEFINITE/ NOT DEFINITE] structure. All stars, gas, and dust are concentrated in the ____________.
Sub-classifications of galaxies:
Elliptical |
| E0 = |
| E1...6 = |
| E7 = |
Spiral |
| Normal (S) |
| Sa = |
| Sb = |
| Sc = |
| Sd = |
| Barred (SB) |
| SBa = |
| SBb = |
| SBc = |
| SBd = |
Part 2- Distance to Galaxy Clusters:
Clusters of galaxies are groups of galaxies that are ____________ __________ together.
When looking at the Virgo cluster, we assume that the galaxies in this cluster are at the _________ ____________.
Another key idea that we need to consider is that the angular size of a cluster will depend on its _________________, assuming their ________ ________ are the same. (Refer Lab 4)