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wooden solar system (model)


chris hennelly
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The sun's diameter is 1,391,684,000 metres so our scale factor if the 'sun' is now 1m in diameter is 1/1,391,684,000 which is 0.000000000719

 

This means that Mercury will be 41 metres away and about 3.5mm in diameter. Venus will be 77.7 metres away and will be 8.7mm in diameter. Earth will be 107m away and will be 9.2mm in diameter.

 

Just type distance from sun to Mars and diamer of Mars into google and multiply the value by 0.000000000719 to do the rest. n.b. don't forget to add an extra 3 zeros onto the 'real' numbers before you convert them so they are in m not km.

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Also the Moon would be 2.5mm in diameter and be 276 mm away from the Earth.

 

you could fit about 30 of the international space station in the diameter of a human hair and they'd be 0.3mm off the surface of the earth. This is fun :)

 

Massive thumbs up for doing this with your kids! More kids need to do fun stuff like this and realise science isn't about sitting in a classroom being bored.

 

The thing that always makes me appreciate the scale of these things (and the fragility of the Earth) is the 'Pale Blue Dot' photo taken by Voyager from the edge of the solar system and Carl Sagan's description of it here:

 

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