Mercury passes between Earth and our star, appearing as a tiny dark spot traveling across the solar surface. In effect, a planetary ‘transit’ happens when any planet passes between an outer planet (meaning one that’s further away from the Sun than it is) and the Sun.
Mercury is the smallest planet in our solar system (since poor Pluto was downgraded) and lies closest to the Sun, with its daytime temperatures hitting a beyond-sweltering 800 degrees Fahrenheit (427 degrees Celsius).
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