JULY 2 , 2013. Lecture 1 AST201H1
Stars and Galaxies
Textbook. The Cosmic Perspective by Bennett, Donahue, Schneider, Voit. 5 or 6h th
Edition. Paper or e-book.
Office hours (AB203):
Clicker quizzes: 7%
Online Assignments: 8%
Midterm 1: 22.5 or 20
Midterm 2: 22.5 or 20
Final exam: 40 or 45
Clicker (bring your clicker to every class, starting next class) Register on Portal.
Weekly assignments on Portal and posted at the end of each week, week after week.
Midterm 1: July 18 th
Midterm 2: August 1 st
Weekly (non-mandatory) tutorials on Wednesdays. Time/location: TBA
Goal: How to think about science by increasing your sense of inquisitiveness,
curiosity, and creativity.
Light is the main messenger. Everything we know comes from light. Properties of
light and how we can extract what we know by knowing light. How stars are born.
How stars produce energy.
Milky Way- our galaxy (darkness is dust and gas trapped by the stars)
Our Place in the Universe:
Deep into the Universe. Looking into the past. Space is huge.
Somewhere in all that “empty” space, there has to be something. 95% of our
universe. Dark matter. Empty space, not really empty, is Planet Earth. Implement that when we look for lives in other planets. Only planet that we know of that
harvest any kind of life.
Our place in the Universe. Pale blue dot, Voyager 1 (mid 70s to take our solar
system). Look at the extend of our universe. Saturn rings. Pale blue dot is where we
are, seen by Voyager through the Saturn rings.
Solar (star) system
A star and all the material that orbits it, including its planets and moons. Earth is one
of the 8 planets orbiting the sun. Until 1995, only solar system. These 8 planets were
the only planets that we know of in the whole universe.
1995 discovered planet-like planet orbiting a sun-like sun.
1000 candidates orbiting around stars like our sun.
Sun- mercury- Venus- earth- mars- Jupiter- Saturn- Uranus- Neptune
First four are rocks
After are gas
Dwarf planets: Pluto, Haumea, Makemake, Eris
When every planet revolve, they don’t encounter any thing else are. But Pluto exists
with other asteroids and