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(astronomy) the Solar System
The Solar System is composed of eight planets, including Earth.
Neptune (eighth planet of the solar system)
Neptune is the eighth planet in the solar system.
(astronomy) planet / (archaic) a dark horse
We discovered a new planet.
orrery
He learned the movements of the solar system using an orrery.
August
August is my birth month.
first / number one / primary
His actions change depending on the circumstances.
ordinal marker, often with affix 号
This is my first attempt.
first, foremost, number one
His first choice of school is the University of Tokyo.
(astronomy) dwarf planet
Pluto is classified as a dwarf planet.
planetary science
He is an expert in planetary science.
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