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1. Define in a few words the two main premises on which some Ancients based their belief in extraterrestrial intelligent life.

1. Define in a few words the two main premises on which some Ancients based their belief in extraterrestrial intelligent life.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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T COM 120 Spring 202: x E My Grades --SBU 10 x O AST 248, Lecture 2 E Google Docs x PHI 104: In-Class Ass X G Estimate how much: Bb AST248 HOMEWORK a blackboard.stonybrook.edu/bbcswebdav/pid-1652718-dt-content-rid-11063886_1/courses/1224-AST-248-SEC01-41082/hw1.html Update A AST 248: The Search for Life in the Universe Spring 2020 HOMEWORK # 1, DUE 4 February Keep your answers short. Approximate answers are fine (i.e., 100 instead of 99.99). The math in the problems is supposed to be straightforward. If you find you are spending a lot of time figuring it out, please email or see me or the TA for help. Include your math calculations if you wish to receive partial credit for typos or simple math mistakes. (You could submit a digital image from your phone, for example.) 1. Define in a few words the two main premises on which some Ancients based their belief in extraterrestrial intelligent life. 2. In one hour, how many kilowatt-hours (kwh) of energy does the Sun radiate? a. About how much power is radiated by the Sun at any time (be explicit with units)? 3. Suppose a star is 8 parsecs (pc) away. a. How many light-years is that? b. How many miles is that? c. What parallax angle, in seconds of arc, do we observe this star to have? d. How long does it take light (or a radio message) to travel from the Earth to the star? 4. About how many times more massive is the Sun compared to the Earth? 5. What is the approximate ratio between the diameters of the Sun and the Earth? 6. What is the approximate ratio of 1 light-year to 1 AU (astronomical unit)? 7. How long does it take, in minutes, for light to travel from the Sun to the Earth? 8. Estimate how much solar power reaches one square mile of the Earth's surface during daytime, assuming the Sun is overhead and ignoring atmospheric absorption or clouds. Give the answer in units of kilowatts (kw), Megawatts (MW) or Gigawatts (Gw). Note 1 MW = 103 kw and 1 GW = 10° kw.
Transcribed Image Text:T COM 120 Spring 202: x E My Grades --SBU 10 x O AST 248, Lecture 2 E Google Docs x PHI 104: In-Class Ass X G Estimate how much: Bb AST248 HOMEWORK a blackboard.stonybrook.edu/bbcswebdav/pid-1652718-dt-content-rid-11063886_1/courses/1224-AST-248-SEC01-41082/hw1.html Update A AST 248: The Search for Life in the Universe Spring 2020 HOMEWORK # 1, DUE 4 February Keep your answers short. Approximate answers are fine (i.e., 100 instead of 99.99). The math in the problems is supposed to be straightforward. If you find you are spending a lot of time figuring it out, please email or see me or the TA for help. Include your math calculations if you wish to receive partial credit for typos or simple math mistakes. (You could submit a digital image from your phone, for example.) 1. Define in a few words the two main premises on which some Ancients based their belief in extraterrestrial intelligent life. 2. In one hour, how many kilowatt-hours (kwh) of energy does the Sun radiate? a. About how much power is radiated by the Sun at any time (be explicit with units)? 3. Suppose a star is 8 parsecs (pc) away. a. How many light-years is that? b. How many miles is that? c. What parallax angle, in seconds of arc, do we observe this star to have? d. How long does it take light (or a radio message) to travel from the Earth to the star? 4. About how many times more massive is the Sun compared to the Earth? 5. What is the approximate ratio between the diameters of the Sun and the Earth? 6. What is the approximate ratio of 1 light-year to 1 AU (astronomical unit)? 7. How long does it take, in minutes, for light to travel from the Sun to the Earth? 8. Estimate how much solar power reaches one square mile of the Earth's surface during daytime, assuming the Sun is overhead and ignoring atmospheric absorption or clouds. Give the answer in units of kilowatts (kw), Megawatts (MW) or Gigawatts (Gw). Note 1 MW = 103 kw and 1 GW = 10° kw.
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