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Astronomy (14)
ASTA01H3 (13)
Chapter

Chapter Eight Review: Mercury/Moon

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Department
Astronomy
Course
ASTA01H3
Professor
Brian Wilson
Semester
Fall

Description
October 18 , 2010 ASTA01H Intro to Astronomy and Astrology Part I Chapter Eight: The Moon and Mercury Orbital Properties Mercury Never strays far from the Sun o Only visible just before dawn or just after sunset Physical Properties Moons radius is 1738km Mercurys radius is 2440km The mass of the Moon is Mercurys mass is Measurements of Mercurys Spin In 1965, astronomers used the Arecibo radio telescope, sending out pulses of radio waves towards Mercury and waiting for the echoes to return o If the planet is rotating, the radiation reflected from the side moving toward us returns at a slightly higher frequency than the radiation reflected from the receding side By measuring the spread of frequencies from either side of the original wave length we can determine the planets rotational speed Mercurys rotational period is 59 days o Exactly two-thirds of the planets orbital period Explanation of Mercurys Rotation www.notesolution.com
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