light decade
(astronomy, physics) A unit of length equal to the distance light travels in one decade.
A word, phrase, or design that is characteristic of Egypt.
sesame
simple past tense and past participle of friggle
天文学者は遠方の銀河間の距離を表すのに10光年を使うことがある。
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DiQt
Free
★★★★★★★★★★