メルキュアへの帰還:メッセンジャーの第1回メルキュア・フライバイのグローバルな展望
Sean C Solomon1, Ralph L McNutt, Thomas R Watters
1Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA. scs@dtm.ciw.edu
Science (New York, N.Y.)
|July 5, 2008
まとめ
MESSENGER宇宙船は,水星がダイナミックな惑星であり,ローベート・スカープによって証明される地球規模の収縮を伴うことを明らかにした. 表面の鉄含有量は6%未満で,冷却室内を意味する.
科学分野:
- 惑星科学は惑星科学である.
- 地質物理学 地質物理学とは地質物理学です.
- 宇宙探査 宇宙探査
背景:
- MErcury Surface, Space ENVIRONMENT, GEochemistry, and Ranging (MESSENGER) ミッションは,水星に関する新しい洞察を提供した.
- マリナー10号からの以前のデータは,水星の構造史の理解を限定していた.
研究 の 目的:
- メッセンジャー宇宙船が水星を通過した時のデータを分析するために.
- 水星の中心,磁場,表面の特徴,構成を含む水星のダイナミック・システムを調査する.
主な方法:
- MESSENGER宇宙船によって撮影された画像の分析.
- 表面の組成を決定するための熱中性子の測定.
主要な成果:
- 水星のダイナミック・システムには,結合されたコア,磁場,太陽風との表面相互作用が含まれています.
- ロバテ・スカープは支配的な構造地形であり,惑星の冷却による地球規模の大幅な収縮を示している.
- トータル・コントラクション・ストレスは,マリナー10のデータから先ほど推定されたものより少なくとも33%大きい.
- 平均的な表面鉄の豊富さは重量6%未満です.
結論:
- 水星の構造的活動と収縮の歴史は,水星の冷却,火山活動,そしてクレーター形成と関連しています.
- 惑星の表面の組成,特に低鉄含有量は,その内部構造と熱的進化のヒントを提供します.
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