Syllabus for Astronomy 101 Basic Astronomy
Section 503 Prof. Lucas Macri - Fall 2014
Howdy! Welcome to Astronomy 101! This course covers a wide range of topics in modern
astronomy and the laws of physics that govern the Universe. This course is intended f
Luminosity = W
Apparent Brightness = W/m^2
Luminosity will be spread out equally among all faces; but it is divided
(not full amount on each face)
Divide that by m^2 of distance/radius
^inverse square law
we use parallax to measure d
Chapter 5: Light- The Cosmic Messenger
Light tells us temperature, speed
Light is a wave
Electromagnetic wave, doesnt need a medium
Can travel through a vacuum
o Half the difference in height between a crest and a trough
Our place in the universe:
Shrinking by a factor of 10 billion
Everything in solar system is 2 or 3 miles
Nearest star is in Alaska
Cosmic collisions are very rare
o 20 million item widths
Galaxies are only 100 items wid
What does our galaxy look like?
The Milky way galaxy appears in our sky as a faint band of light
Dusty gas clouds
Because they absorb visible light
THIS IS THE INTERSTELLAR MEDUIUM THAT MAKES NEW STAR SYSTEMS
We see our galaxy edge-o
Watch pre-lecture videosPrelecture quiz (30 min) before EACH CLASS
Homework due before Thursday class
Write down underlined words
No need to write down anything on the slides bc online
5 hours outside of homework for studying
Scientific no tation is used in science because
a. it mak es it easy to wr ite b ig or small numbers.
b. all astronomical distan ces ar e expressed in metric un its.
c. it mak es conversions between units easy.
d. all of the above
The Life and Death of
Tychos Immediate Family
He was born on December 14, 1546 in the
Danish city of Sconia.
Father was Otte Brahe- Danish nobleman
Mother was Beate Billie- came from a family that
produced multiple churchmen and politicians.
Shakespeare and Tycho
Born on December 14, 1546 in the Danish
city of Sconia.
Was unofficially married to Kristen Hansen
Died from mercury poisoning on October
Beliefs and his
Isaac1642 to March 20, 1727
Lived from December 25,
He was an English physicist, mathematician,
astronomer, natural philosopher,
Expansion of the
The velocity of an object is
plotted with respect to its
distance from the observer.
1929- Hubble compared his
measurements to Sliphers
measurements of redshift.
Vesto Slipher discov