Sagan's number
prehardened
(astronomy) The total number of stars in the observable universe, often estimated to be in the sextillions.
An act of jeering or heckling. / (Australia, New Zealand) The act of cheering for or supporting a team.
An angle or space which cannot be seen or defended from behind the parapet of a fortification.
天文学者が宇宙のスケールを論じるとき、観測可能な宇宙に存在する恒星の総数を示して、どれほど多くの星があるかを伝えることがよくあります。
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