| 单词 | advanced composition explorer |
| 释义 | Advanced Composition ExplorerAdvanced Composition Explorer(ACE) A NASA satellite, launched in 1997 to measure the isotope and element abundances in the solar corona and cosmic rays over a wide range of energies. It is in orbit around L1, one of the Lagrangian points of the Sun–Earth system, 1.5 million km nearer to the Sun than Earth is. |
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