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(astronomy) galaxy cluster
The study of galaxy clusters is essential for understanding the universe.
understanding, comprehension / appreciation
It's difficult to understand his explanation.
(astronomy) supercluster
A supercluster is part of the large-scale structure of the universe.
understand, comprehend / appreciate
indispensable, essential
Water is indispensable to human life.
indispensability, being essential
the universe / outer space
I dream of traveling through the universe someday.
a piece of research, a study, investigation
He is conducting research on a new energy source.
to research, to study
He is researching about a new energy source.
(astronomy) Synonym of 銀河系 (Gingakei, “Milky Way”); the Galaxy
He began to talk about the beauty of the galaxy.
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