近期，美国普惠公司发布了其氢能源发动机项目“HySIITE（氢-蒸汽喷射中冷涡轮发动机）”的最新进展，并公布了部分原理示意和技术验证试验的图片。普惠公司在媒体发布会上强调，相较于GTF齿轮减速涡扇发动机，HySIITE系统不仅能实现飞行中碳排放为零， ...

To map out the best nights for skywatching, we turned to three seasoned stargazers to tell us about the best nights of the ...

March 2025 features Venus transitioning from the evening to the morning sky, with a bit of overlap; the year’s best evening ...

In March the bright winter constellations of Canis Major, Canis Minor, Orion, Gemini, Taurus and Auriga fill the southern sky stretching all the way to zenith — the point directly overhead. Directly ...

The noon Sun stands directly over Earth’s equator at 5:01 a.m. EDT on March 20. This point is the vernal equinox, or simply ...

In March the bright winter constellations of Canis Major, Canis Minor, Orion, Gemini, Taurus and Auriga fill the southern sky stretching all the way to zenith — the point directly overhead. Dire ...