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Old February 21 2014, 05:52 AM   #10
gturner
Admiral
 
Location: Kentucky
Re: Why don't they crash?

Take the sun as an average star, with a diameter of 1.4e6 km. Assume the average star is the only significant object in a radius of 3 light years, then as you pass through them the cross sectional area (perpendicular to the ship's travel) has the empty circle being larger than the star in area by a factor of about 4.0e14. Given that ratio of empty area to stars (if plotted on a sheet), you'd have to travel across the entire diameter of the Milky Way about 250 million times to have a 1 percent chance of randomly hitting a star.
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