Translation guide
The Japanese word for comet is 彗星 (すいせい). This is the standard term used in astronomy and everyday language.
Referring to a comet as a celestial body.
The standard Japanese word for comet, used in both scientific and general contexts.
昨夜、彗星が見えた。
Last night, I saw a comet.
ハレー彗星は有名だ。
Halley's Comet is famous.