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(astronomy) black dwarf
It is believed that black dwarfs are formed by the cooling of white dwarfs.
(astronomy) Sirius, Dog Star
Sirius is the brightest star in the night sky.
Synonym of 宇宙人 (uchūjin, “alien”) (life form of non-Earth origin)
Please imagine the day when aliens come to Earth.
circumpolar star
The circumpolar star is always visible in the north.
(organic chemistry) alkyne
Alkynes play an important role in organic chemistry.
(organic chemistry) alkene
Alkenes play an important role in organic chemistry.
(organic chemistry) alkane
Alkanes are basic components of organic chemistry.
an African American
He is studying the history of African Americans.
parasympathetic nervous system
The parasympathetic nervous system helps our body to relax and conserve energy.
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