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A canyon on Mars would span the United States

Valles Marineris on Mars is long enough to stretch from California to New York.

Why it is true

The canyon system is the largest in the solar system. It runs about 2,400 miles, spans 370 miles at its widest, and drops 5.8 miles at its deepest.

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A comet has two tails, one of dust and one of ionized gas.

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Pluto is only about 1,400 miles wide, roughly half the width of the United States.

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A light-year is the distance light travels in one Earth year, about 6 trillion miles.

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