AST 204 February 4 2008
LECTURE I: THE EXPANDING UNIVERSE, THE CRITICAL DENSITY,
AND THE AGE OF THE UNIVERSE
I. The Observations, Simplied
We live in an expanding universe, a fact which we have known for about seventy years.
What does this mean? We live i
AST204 February 6, 2008
LECTURE II: THE REDSHIFT AND THE WHISPERS OF CREATION:
THE COSMIC MICROWAVE BACKGROUND
I. The Past and Future of the Universe
Last time we derived the Friedman equation, which describes the expansion of the universe:
R2 8GR2 /3 = 2
LECTURE 3: SPACETIME AND GEOMETRY:
AN INTRODUCTION TO SPECIAL RELATIVITY
AS204 February 11 2008
I. The Geometry of Space
You are used to dealing with vectors in ordinary 3-dimensional space, and to specify locations in space by means of coordinates, like
AST 204 13 February 2008 Lecture 4
A. More Spacetime and Geometry
I. Like Time or Distance? Timelike and Spacelike Vectors
The square of the interval (or modulus, as we shall call it for 4-vectors not connecting two
events) associated with a 4-vector u is
LECTURE VII: THE EARLY UNIVERSE, FLUCTUATIONS,
AND THE DEVELOPMENT OF STRUCTURE
AST 204 25 Feb 2008
I. The Planck Era and the Notion of Time and Space
First thing today, well discuss the fact that theres an epoch, associated with a density, a
AST 204 Feb 18 2008: Due Feb 25 2008
PROBLEM SET 2
There is a famous paradox in relativity theory, the twin paradox, in which one twin goes
on a journey on a spaceship which reaches very nearly the speed of light to some distant
star and then returns simi
AST 204 Topics in Modern Astronomy (QR)
Lectures: Mondays & Wednesdays, 3:00 p.m. 4:20 p.m.
Location: Room 145 Peyton Hall (also known as The auditorium)
16. Discuss the critical role of quantum eects for the nuclear fusion inside stars.
17. Describe the evolutionary path of a solar-mass star. Discuss which conditions are
necessary for the occurence of a helium ash.
18. Describe the physics that goes into
11. Consider a spherically symmetric star in which the density as a function of radius
(r ) = 0 1
where 0 is a constant and Rp is the radius of the star.
a. Calculate the total mass of the star.
b. Calculate the pressure of the star at
Astro 204: Practice Questions
Some of these questions are a bit harder than the average exam question, be it the nal
or the mid-term. However, if you can do and understand these questions, the nal, in
particular, should be a breeze.
1. If a spherical plan