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Unformatted text preview: Hypotheses must be Explanatory predictive Scientific method - make a hypothesis, test it, revise hypothesis, repeat Results should be reproducible Always open to modification A sense of scale Space and time are enormous beyond reckoning Things to measure Length SI - Meter = distance lights travels in 1/2999702458 s. Astronomical Unit (Average distance from earth to sun)-150 million km Light Year-9.5 trillion km Parsec-30 trillion km 1 degree = a 1/60th of an arc minute 3600 arc seconds in 1 degree Solar Mass = Exact mass of our sun The earth is spinning on its axis, and not just in one direction The earth and everything on it is moving at about 15,000 Kilometers Our Sun and the stars of the local solar neighborhood orbit around the center of the Milky Way Galaxy every 230 Million years The Milky Way moves with respect to other galaxies All distant galaxies are moving away from each other Seaons - Created because earths orbit around sun Day - Created because earths rotation around its axis Month - Created because of moons orbit...
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