Pluto is one of the planets in the solar system.

Please check this detailed document.

Hiragana is one of the characters in Japanese.

I am studying Japanese katakana.

I forgot my username.

Man'yōgana is an ancient Japanese script that used Chinese characters as syllabic characters.

Observing dark nebulae is difficult.

In this chemical experiment, we will examine the properties of benzoic acid.

He decided to challenge the exploration of the Dark Continent.

Dark matter is covering this world.