Our solar system is so big it is almost impossible to imagine its size if you use ordinary units like feet or miles. The distance from Earth to the Sun is $93$ million miles ($149$ million kilometers), but the distance to the farthest planet Neptune is nearly $3$ billion miles ($4.5$ billion kilometers).
Compare this to the farthest distance you can walk in one full day ($70$ miles) or that the International Space Station travels in $24$ hours ($400,000$ miles).
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