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SNC1D Date: Activity – Scale Drawing of the Solar System - SOLUTIONS Astronomical Units: The distance from the sun to the Earth, 1.49 108 km, is defined as an Astronomical Unit (AU). Therefore: 1 AU = 1.49 108 km The following table shows the distances of planets from the sun, in metric units. How to converting from kilometers to AU Example: Mercury 581 . 10 7 km 1 AU = 0.39 AU 149 . 108 km Instructions: 4) Using the conversion factor above, calculate the distances of planets from the sun in Astronomical Units (AU). 5) Using an appropriate scale of your choice (i.e. 1 cm = 1 AU). 6) Using the back of this sheet, sketch part of the orbits of the major planets to scale with respect to distance. Use a dotted line to represent the orbits. Hint: to fit your scale, you might have to position the Sun at the corner of the sheet. Planet Distance from Sun (km) Distance from Sun (AU) Distance on paper (cm) Mercury 5.81 107 km 0.39 0.39 Venus 1.08 108 km 0.72 0.72 Earth 1.49 108 km 1 1 Mars 2.28 108 km 1.53 1.53 Jupiter 7.78 108 km 5.2 5.2 Saturn 1.42 109 km 9.5 9.5 Uranus 2.87 109 km 19.2 19.2 Neptune 4.49 109 km 30.1 30.1