ASTR 105 Lecture Notes - Lecture 9: Scientific Notation, Sidereal Time, Lunar Phase
Lab AST 105 Lecture Notes 9:
• Why do scientists use "scientific notation" to express numbers
• It makes extremely large and small numbers easy to work with
• What is the closest star to Earth
• The Sun
• Define "Solar System"
• The system of objects that has a Sun in the middle
• Define "Galaxy"
• A large assemblage of stars, gas, and dust bound together by their mutual gravitational
attraction
• Define "The Universe"
• All things which are connected by space and time
• Define "Star Cluster"
• A group of stars that really are close to each other
• Define "Constellation"
• A loose group of stars that merely appear close together on the sky
• Whats a "Light Year"
• The distance light travels in one year
• How many other galaxies are there in the universe
• Billions, perhaps infinite
• What is a "star"
• A saint hot ball of gas in space
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• What are the three valid uses of constellations accepted by astronomers
• Navigation, Tell time of year, Convenient map
• Difference between Astronomy and Astrology
• Astronomy is real science, astrology is a belief system
• What is a group of stars born physically together
• Star Clusters
• Why do stars have different colors
• Due to temperature
• How far are the closest stars
• Trillions of miles away
• Define a "Theory"
• A hypothesis that has successfully satisfies many and all experiments performed
• Define a "Hypothesis"
• A proposed explanation that hasn't been tested
• What did ancient civilizations interpret astronomical phenomenons such as solar eclipse
to be
• Signs from gods or spirits
• Why was the Earth not considered a planet in ancient times
• Because Earth was the center of the universe
• What is the Geocentric Model
• Model in which Earth is the center of the universe and everything revolves around it
• What model of the universe did every ancient civilization believe in
• The Geocentric Model
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