Ast 1001
R.M. Humphreys
Review Sheet for Final Exam
I. The Milky Way as a Galaxy
Appearance of Milky Way
Variable Stars – Cepheids, period-luminosity relation
Size, structure, and morphological type
Rotation and mass
The galactic nucleus
II. Normal Galaxies
Historical – the nature of the nebulae
Types of galaxies and their properties
Extragalactic distance scale
Distance – redshift relation
Galaxy clustering and large scale structure
Missing mass problem and dark matter
III. Active Galaxies
Peculiar Galaxies – evidence for mergers and disturbances in nucleus
Radio Galaxies
Quasars
IV. Cosmology and the Big Bang
Observational evidence
The standard Big Bang model
3 ˚K cosmic microwave background radiation
Four fundamental forces
Open or closed?
Critical Density
Acceleration and dark energy
V. Life in the Universe
Astronomical conditions
IS travel vs. IS communication