2PTYS_206_solar_system_scales

2PTYS_206_solar_system_scales - Solar System Scales...

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PTYS/ASTR 206 – The Golden Age of Planetary Exploration Shane Byrne – [email protected] Solar System Scales

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PYTS/ASTR 206 – Solar System Scales 2 Measuring length, mass and time Angular sizes and real sizes Distances between solar system objects Timescales of the solar system Scientific notation In this lecture…
PYTS/ASTR 206 – Solar System Scales 3 Units are vital! E.g. How far away is it? Two hundred – a meaningless answer! Two hundred meters – this means something How old is it? 46 – means nothing Seconds or years?? In science we use the metric system (SI units) Length is in meters (1m = 3’ 3.4”) Time is in seconds Mass is in kilograms (1Kg = 2.2 pounds on Earth) MKS units We’ll use these throughout the course CGS units Metric system using centimeters, grams, seconds We won’t use this. Length, Time and Mass

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PYTS/ASTR 206 – Solar System Scales 4 1s The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations. 1m Originally 1/10,000,000 of the distance between the equator the pole 1983: The distance traveled by light in a vacuum in 1/299,792,458 sec
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This note was uploaded on 01/01/2011 for the course PTYS/ASTR 206 taught by Professor Shanebyrne during the Spring '07 term at Arizona.

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2PTYS_206_solar_system_scales - Solar System Scales...

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