ASTRO 10100 Study Guide - Quiz Guide: Redshift, Special Relativity, Steady State Theory

In which of the following models will the universe stop expanding? 

A. Open Universe
B. Closed Universe
C. Steady State Universe
D. Critical Density Universe
E. All have an ultimate collapse.

The spectra of most galaxies show redshifts. This means that their spectral lines
(a) always are in the red part of the visible spectrum.
(b) have wavelengths that are longer than normal.
(c) have a higher intensity in the red part of the spectrum.
(d) have wavelengths that are shorter than normal.