Chapter 21 study guide.
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What is electromagnetic radiation?
What are the 7 different categories of electromagnetic radiation?
Explain something special about each type of electromagnetic radiation
Why do we look at stars through different telescopes that can “see” different types of electromagnetic
radiation?
What is the definition of wavelength?
What is the longest wavelength of visible light?
What is the shortest wavelength of visible light?
What does the Earth have that protects us from most of the harmful types of electromagnetic radiation?
What are the 3 things astronomers look at to classify stars?
Because space is so big, scientists use a different kind of measurement to measure distance. What is it?
Define the term in # 10
What is the difference between a galaxy and the universe?
How many stars are in a typical galaxy?
How many galaxies are in the universe?
How far does light travel in one second?
Stars range in size. List the 6 basic sizes for stars from smallest to biggest
How do astronomers determine a star’s temperature?
Stars range in temperature. List the colors of stars from the hottest to the coolest.
What is the Hertzsprung –Russell Diagram?
What two characteristics of stars does it compare? (look at the x and y axis for this information)
What are main sequence stars?
How many of the stars in our universe fall within the main sequence category?
What is the difference between absolute and apparent magnitude?
Why is absolute magnitude more important when discussing a star’s characteristics?
KNOW HOW TO READ A HERTZSPRUNG-RUSSELL DIAGRAM, THERE WILL BE ONE ON THE TEST
What is a baby star?
From what are all baby stars formed?
How is the life-span (time a star “lives”) determined in stars?
How long will a supermassive star typically live?
How long will an “average” sun-sized star usually live?
How long will a smaller star like a white dwarf, neutron star, or any star that is less massive than our sun live?
From what type of star do neutron stars and black holes form?
From what type of star do white dwarfs form?
What is a quasar?
What is at the center of any quasar?
How is all the light and heat created in a quasar?
What is a star system?
What is a star system that is made up of two stars called?
What is a star system made up of three stars called?
What is an eclipsing binary star system?
How do astronomers find eclipsing binary star systems?
What are the three types of galaxies?
Describe the shape of each type of galaxy
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Describe a characteristic of each type of galaxy
What is the most massive object in the solar system?
Are these big objects or small objects?
What is the big-bang theory?
How long ago do astronomers think the universe was formed?
Use the two graphic organizers (below) to illustrate the life cycles of different mass stars: