Project #2238 - Astronomy

can you answer these questions so i can review for my exam on monday


Measuring the Properties of Stars




1.) Describe the method of distance measurement by triangulation.








3.) How is the parsec defined? How big is a parsec compared with a Lightyear?








4) how do astronomers measure a stars temperature?








6.) What is luminosity? What two characteristics of a star determinates luminosity?








10.) What is different about the spectra of different types of stars?








11.) What is a binary star? How are they useful to astronomers?








12.) How do visual and spectroscopic binaries differ








14.) What is the H-R diagram? What are its axes?








15.) What is the main sequence?








16.) How do we know that giant stars are big and door stars are small?








17.) How doesmass vary along the main sequence








21.) What is a standard candle and how is it used?








Stellar Evolution




1.) What are the approximate mass and radius of a white dwarf compared to those of the sun?








2.) how does a white dwarf form?








3.) what keeps a white dwarf hot?








6.) what makes a nova occur?








7.) what is the neutron star?








9.) how does a neutron star form?








11.) what is a pulsar? Does it pulsate?








14.) what is nonthermal radiation?








16.) what is a blackhole? Are they black? What properties can they have?








19.) can astronomers see black holes? Explain.


The Milky way Galaxy




1.) what does the Milky Way look like in the night sky?








2.) how do we know our galaxy isa flat disc








5.) Roughly how big and diameter is our galaxy and how much mast doesn't contain?








6.) what are some differences between pop I and pop II stars?








9.) how do we know that some interstellar matter is dust? What is the other main category of interstellar matter?








12.) What are some ways we could know cold clouds of gas exists in space?








15.) how can we determine the Milky Way's diameter?








16.) how can we determine the Milky Way's mass?








17.) what is meant by dark matter? Why do astronomers conclude that the Milky Way may contain such unobserved material?








18.) what is the evidence for a black hole at the center of the Milky Way? How does it compare to the black holes discussed in chapter 15








21.) what is meant by pop III stars?


Subject Science
Due By (Pacific Time) 02/10/2013 12:00 am
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