How small are we: with a dot from a sharpened pencil point as the sun all planets, our solar system, would be inside a circle with a 7′ diameter Mercury = .4″ radius Venus = .7″ radius Earth = 1″ radius Mars = 1.6″ radius Jupiter = 5.2″ radius Saturn = 9.5″ radius Uranus = 19.2″ radius Neptune = 30″ radius Pluto = 39.5″ radius the closest star to our solar system, Alpha Centauri (which is about the size of our sun), would be 4.5 miles away