After nine years of scanning the sky, the Wilkinson Microwave Anisotropy Probe(WMAP) ( WMAP ) space mission has concluded its observations of the cosmic microwave background, the oldest light in the universe. 经过9年对天际的扫描,威尔金森各向异性微波探头(WMAP)航天任务得出了对宇宙微波背景辐射(及宇宙早期“光线”)的观测结论。