Lesson 1: Thinking Like an Astronomer
Lesson 1: Thinking Like an Astronomer ASTR 101
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This 2 page Class Notes was uploaded by Evan Kirkpatrick on Sunday October 4, 2015. The Class Notes belongs to ASTR 101 at University of Washington taught by Ana Larson in Fall 2015. Since its upload, it has received 64 views. For similar materials see ASTRONOMY (NW,QSR) in Environmental Science at University of Washington.
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Date Created: 10/04/15
Lesson 1 Astronomy Thinking Like an Astronomer Vocab Cosmological Principle Same physical laws that apply on Earth apply everywhere else Occam s Razor When two hypothesis state the same thing we accept the one with fewer assumptions Our Place We live on planet Earth Revolve around the Sun 0 Sun ordinary average star Solar System 8 planets Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Galaxy Milky Way Other close galaxies to us form the quotLocal Groupquot 0 Milky Way and Andromeda are the biggest Scale of the Universe Measure distance in terms of speed of light 300000 kilometers per second Origin Universe formed 138 billion years ago Big Bang Only elements were Hydrogen and Helium 0 Small amounts of lithium Beryllium and Boron Atoms combined to form massive atoms like carbon These atoms combine with others from other material lost from stars to create gasdust clouds These end up forming into new planets and stars What Astronomers Use Satellites to observe from space Sputnik Light rays Gamma X Ultraviolet Visible Infrared Radiation Radio TelescopesComputers Scienti c Method A way of experimenting with new ideas Begins with an observation or fact Then create a hypothesis prediction 0 An explanation that for the observation that is testable Create an experiment to test the hypothesis If the experiment fails it is considered falsi ed o Rerun with a different hypothesis Ideas that aren t falsi able are slowly accepted until they become theories Hierarchy of Scienti c Knowledge Theory An idea that hasn t been falsi ed and has been tested numerous times Hypothesis An idea that leads to an experiment to test it Fact An observation or measurement Idea A thought to explain something Reading Graphs Read both axes to understand what the graph is measuring Rising slope increasing falling slope decreasing Find patterns in slope and rate of change of graph