The Big Bang and Beyond
of 120 Lecture 2: Cosmology and the Big Bang What is the cosmology? Cosmology is the science of the origin and development of the universe. What is The Pale Blue Dot? The pale blue dot is what we call earth from the image ...
Lecture 2 (missed notes) Galaxy: a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. The galaxy in which the earth is located is a diskshaped spiral galaxy with...
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