2020 April 6
Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 1672, featured here, was captured in spectacular detail in an image taken by the orbiting Hubble Space Telescope. Visible are dark filamentary dust lanes, young clusters of bright blue stars, red emission nebulas of glowing hydrogen gas, a long bright bar of stars across the center, and a bright active nucleus that likely houses a supermassive black hole. Light takes about 60 million years to reach us from NGC 1672, which spans about 75,000 light years across. NGC 1672, which appears toward the constellation of the Dolphinfish (Dorado), has been studied to find out how a spiral bar contributes to star formation in a galaxy’s central regions.
Tomorrow’s picture: northerly
说明: 许多螺旋星系有棒状的核心，就连我们的银河系，咸认也有一个中等大小的核心棒。上面这幅明亮棒旋星系NGC 1672的超高解析主题影像，是由轨道上的哈勃太空望远镜所拍摄。在这幅影像中，可见到丝缕状的黝黑尘埃带、泛蓝亮星聚成的年轻星团、辉光氢气所组成的泛红发射星云、一道横过星系核心由明亮恒星所构成的长棒结构、以及一个可能藏有超大质量黑洞的明亮活跃星系核。位剑鱼座方向的NGC 1672，离地球约6千万光年远，大小则约为75,000光年。对NGC 1672所进行的研究，主旨是要厘清核心棒对星系核心区的恒星诞生有何贡献。