まとめ
火星の大気中に分子酸素が検出され,二酸化炭素の光分解によって予想されるよりも高い豊富さを明らかにしました. これは,おそらく水からの酸素の潜在的な純源が赤い惑星にあることを示唆しています.
科学分野:
- 惑星科学 惑星科学
- 大気科学 大気科学
- 天体生物学 アストロバイオロジー
背景:
- 火星の大気の組成は,惑星の進化と過去または現在の生命の可能性を理解するために重要です.
- 以前のモデルでは,二酸化炭素の光分解が大気中の酸素の主要な源であるべきだと示唆されていた.
研究 の 目的:
- 火星の大気中の分子酸素を検知し,定量化するために.
- 観測された比率と理論的な予測を比較することによって,火星の大気中の酸素の源を調査する.
主な方法:
- 火星の大気データを7635アングストロムの近くで分析した.
- 1971年の塵の嵐の間,そしてその後の分子酸素柱の豊富さの測定.
主要な成果:
- 分子酸素は,クリアな火星の大気圏で10.4 +/- 1.0cm amagatの柱豊富さで検出されました.
- 分子酸素と二酸化炭素の混合比は1.3 x 10^-3.と決定されました.
- 分子酸素と一酸化炭素の混合比率 (1.4 +/- 0.3) は,0.5.の予想値から有意に異なった.
結論:
- 観測された酸素の豊富さと混合比は,火星の大気中の炭素に対する酸素の純源を示している.
- この純酸素源は,純粋な二酸化炭素の光分解以外の物質から発生している可能性があり,水の可能性が高い候補である.
- この発見は,火星の大気化学と火星の歴史を理解する上で重要であり,過去に火星が居住可能であった可能性も含まれます.
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