21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 12, Problem 17QP
To determine

The criteria that was not fulfilled by Pluto under the new IAU definition in order to be considered as a planet.

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Which of these things did the Voyager spacecraft discover about Enceladus in the early 1980s, indicating that it is somewhat unusual among planetary bodies in our solar system? Check the TWO items that apply.   a It has a thick atmosphere, made mostly of nitrogen. b It has the darkest, least reflective surface of all the known planetary bodies. c It is the brightest (i.e. most reflective) object in the solar system. d The entire surface is more heavily-cratered than any other body in our solar system. e Its surface is very smooth in some places.
Pluto has been hard to measure from Earth because of the atmosphere. In 2007 Young and Buie measured Pluto as having a diameter of 2322 km. In 2015 the New Horizons probe reached pluto and measured it up close and we now know the actual diameter is 2372 km. What was the percent error of the 2007 measurement? Enter your answer as a percent with a negative value if the 2007 measurement was too small and a positive value if it was too large.
Pretend you are a NASA executive or a legislator. Design a new mission in our solar system.    Pick any object in the system and decide whether you want to send an orbiter, a lander, a    rover, some combination or those, a manned mission, or something else. What interests you about    this object? What science questions can we answer? In basic terms, what kind of scientific    instruments might you want to include on your mission? Justify your decisions with what you    know about the scientific method, astronomy techniques, and the object itself from this class.
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