They tell us about collisions between galaxies.
How did our galaxy form?
As a large cloud of dust spiraling and contracting together.
What lies in the center of our galaxy?
A massive black hole.
What are the three major types of galaxies?
Spiral, elliptical and irregular.
How are galaxies grouped together?
In spiral and elliptical clusters.
How do we measure the distances to galaxies?
by measuring the light they emanate.
What is Hubble's law?
H=v/d
How do distance measurements tell us the age of the universe?
We can tell how much the universe is expanding from a central point.
Name a galaxy nearby.
Draco Dwarf
What is the mass of the black hole in the center of the galaxy?
4 million times the mass of our sun.
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