Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 17: Galaxies

Thought Questions

1
Hubble proposed that his tuning-fork diagram might represent evolutionary changes with E galaxies gradually changing to S galaxies. What evidence based on the amount of interstellar matter and kind of stars in E and S galaxies indicates that this is very unlikely?
2
If you wanted to look at your mother when she was a baby, how far out in space would you need to be? (Assume you have a sufficiently powerful telescope and pretend that you can travel instantly to any distance.) How does this relate to astronomers studying young galaxies?
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