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Here are the first 2 questions. The rest are attached... 1) If an observer in the northern hemisphere faces due north at nightfall, the constellation Ursa Minor contains the asterism known as the _______ _________. This constellation contains _________ otherwise known as the North Star. 2) During the night, one expects the north star to a) set in the east b) set in the west c) pretty much stay where it is d) dip up and down along with the rest of the dippers

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1. The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance? ---------------------------------------------------------------------------------- 2. Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun.

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1. Given that the angular diameter of the sun is 1/2 degree and that its distance is 1.5X10^8 kilometers, go through the math to determine the Sun's diameter. -------------------------------------------------------------------------------------------- 2. Calculate the escape velocity from the Sun.

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Given that the angular diameter of the sun is 1/2 degree and that its distance is 1.5X10^8 kilometers, go through the math to determine the Sun's diameter.

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Calculate the escape velocity from a red giant's atmosphere (use the formula for escape velocity from chapter 2). Assume that the star's mass is 1 M and its radius is 100 R How does this compare with the speed at which a planetary nebula shell is ejected?

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1. Hold a small rubber ballon top of a basketball, and drop them together toward the floor. What happen to the small ball? Does that help you understand what happens to the outer layers of a supernova as they collapse on the core? ------------------------------------------------------------------------------ 2. Take a plastic ball and put a little soapy water in it. Run your finger across the mouth to make a soap film. Now, without breaking the film, run hot water over the bottle. What happens to the soap film? How does this relate to what happens to a star when it is heated?

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Calculate the escape velocity from a white dwarf and a neutron star. Assume that each is 1 solar mass. Let the white dwarf's radius be 10^4 kilometers and the neutron star's radius be 10 kilometers.

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Can anyone explain to me the controversy of Pluto as a planet? I'm not looking for an essay, just a descriptive answer about the subject (about a paragraph or two).

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1. Gas is observed to be orbiting in a circle at 200 km/s about a dark central mass. If the gas's orbit has radius of 1 parsec, how much mass must be present to hold it in orbit? --------------------------------------------------------------------------------------------- 2. Suppose the mass in problem 2 were packed into a sphere whose radius is 20 AU. Would it be a black hole?

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1. A galaxy has a rotation speed of 200 kilometers per second at a distance from its center of 10 kiloparsecs. What is its mass within this distance? ------------------------------------------------------------------------------------------------ 2. A galaxy has an angular diameter of 0.1 degree. Its distance is 10 megaparsecs . What is its true diameter?

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Given that Pluto's mass is 1.3X10^25 grams and its radius is 1.1 X 10^8 centimeters, what is its average density? Does this indicate that Pluto has large iron core like the Earth? Why? ------------------------------------------------------------------------------------------------ A lunar crater has an angular diameter of 1 minute of arc. What is its Diamterin kilometers? ----------------------------------------------------------------------------------------------- Calculate the Moon's density. The Moon's mass is about 7.3 X 10^25 gm, and its radius is about 1.7 X 10^8 cm. On the basis of your value for the density, what can you say about the amount of iron in the Moon? -----------------------------------------------------------------------------------------------

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Please read the included PDF file. Please send me the answers to my e-mail, jh_82@hotmail.com. Please try to write the answers clearly. Sometimes, I couldn't read answers. Please do this as soon as possible.

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Please read the included PDF file. Please send me the answers to my e-mail, jh_82@hotmail.com. Please try to write the answers clearly. Sometimes, I couldn't read answers. Please do this as soon as possible.

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Not sure if content supports title. If not, need suggestions on how to beef it up. Need help with citations page. Have to use MLA style. Thank you.

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This is a homework assignment for a class called Astrophysics. The book that we're using in this class is "An Introduction to Modern Astrophysics" by Carroll and Ostlie, 2nd edition. The whole book can be downloaded from the link below: https://www.yousendit.com/download/bVlDb2VCZEtRYThLSkE9PQ After 6 days the file will be deleted. Also, the book is in "djvu" format and you need to install "djvu" in order to see the book. "djvu" can be downloaded from this link: http://djvu.org/ I've attached the list of the problems with some hints for the problems along with this message. All problems are from chapter 25 (The nature of Galaxies) of the book.

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Please read the following article : ``Infrared Adaptive Optics Reveals Stars Orbiting Within Light-Hours of the Milky Way's Center''. Write a short 1 page summary of the key point(s) of the article. Article is at this link: http://www2.physics.umd.edu/~jacobson/171c/ourbhart.htm

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The Schwarzschild radius of black hole that contains 6.7436 x 10^32 kg is _____ meters.

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Given that the tempature of a body decreases as the square root of its distance from the Sun's increase, estimates the temperature of a comet nucleus in the Oort Cloud. Take the temperature at 1 AU to be 300 Kelvin.

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