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planetary science
He is an expert in planetary science.
(astronomy) a dwarf planet
Pluto is classified as a dwarf planet.
state of emergency (governmental decree)
The government declared a state of emergency to prevent the spread of the new coronavirus.
a terrestrial planet
A terrestrial planet may have an environment similar to Earth.
a Jovian planet
A Jovian planet is similar to Jupiter in terms of its size and composition.
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