Solar System planet with the longest orbital year

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Your new ahaNeptune

Neptune's existence was predicted mathematically before its confirmed observation. Source: Neptune ↗

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36Planet known for Olympus MonsRECALL
Mars
Olympus Mons is the largest known volcano in the solar system
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37This volcano on Venus showed a changing vent in 1991 Magellan radar images, reported in 2023.RECALL
Maat Mons
The radar images show a vent changing shape and size. Some dramatic 3D views exaggerate vertical relief, so they should not be read as…
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38This planet is the smallest in the Solar System.RECALL
Mercury
It is the closest planet to the Sun
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