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Wednesday September 12.docx

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Department
Astronomy
Course
ASTR 1P01
Professor
Bozidar Mitrovic
Semester
Fall

Description
Wednesday September 12, 2012 Astronomy Lecture 3: - How long does it take light to travel this distance? - Time = earth-sun distance/speed of light = 150,000,000km/300,000km per/s = 500 s= 500/60 min= 8 mins and 20 seconds = 8.3 mins - So 1 au = 8.3 light-minutes (LYM) - Light-minutes is the distance which light travels in 1 min 110 Au: - Solar system = sun+ 8 planets + the satellites and rings + asteroid belt (half way between mars and Jupiter) + dwarf planets (Pluto, Eris…) + comets + meteoroids ( -> meteors (shooting star) -> meteorites) - In 2006 IAU (international astronomical union) set a set of criteria for an object to be a planet (
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