This planet is the smallest in the Solar System.

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ScienceOne small aha

Your new ahaMercury

Mercury has a very thin exosphere rather than a substantial atmosphere. Source: Mercury (planet) ↗

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39This planet takes longer to rotate once relative to the stars than to orbit the Sun.RECALL
Venus
Venus's sidereal rotation takes about 243 Earth days and its year about 225. Its sunrise-to-sunrise solar day is about 117 Earth days;…
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40This tilt relative to Earth's orbital plane is the main reason for the seasons.RECALL
Earth's axial tilt
The tilt changes the angle of sunlight
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41This reddish iron compound gives much of Mars's surface its colour.RECALL
Iron oxide
Rust colours its surface dust
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