1
.
How are distant (young) galaxies different from the galaxies that we see in the
universe today?
The younger, distant galaxies were much smaller and not as bright but contained high
rates of gas.
2
.
What is the evidence that star formation began when the universe was only a few
hundred million years old?
The oldest dated clusters studied that contained stars were around 13 bil. years old.
3
.
Describe the evolution of an elliptical galaxy. How does the evolution of a spiral
galaxy differ from that of an elliptical?
Elliptical galaxies begin to collapse and form stars and those stars then merge with
smaller galaxies
4
.
Explain what we mean when we call the universe homogeneous and isotropic. Would
you say that the distribution of elephants on Earth is homogeneous and isotropic? Why?
That means the universe looks alike wherever you’d look, in any direction it would look
the same. Not all elephant inhabited areas look the same because population and
distribution vary by region.
5
.
Describe the organization of galaxies into groupings, from the Local Group to
superclusters.
Local group galaxies include the milky way, M33, and andromeda. They are all part of a
huge cluster called the Virgo supercluster. Superclusters expand almost billions of
lightyears throughout space like many organized streams.
