星系、恒星和尘埃
(原标题: Galaxies, Stars, and Dust)
2025-08-28
浏览次数: 1543
这张构图良好的望远镜视野覆盖了天空中飞马座的满月。当然，较亮的恒星有衍射峰，这是反射望远镜中常见的内部支撑效应，它们位于我们的银河系内。暗淡但无处不在的星际尘埃云在银道平面上方行驶，模糊地反射着银河系的星光。它们被称为星系卷云或综合通量星云，与银河系的分子云有关。事实上，距离不到一千光年，编号为MBM 54的漫射云占据了整个场景。看起来纠结在尘埃云中的星系是引人注目的螺旋星系NGC 7497。不过，它距离我们大约6000万光年。NGC 7497的旋臂和尘埃带几乎是在靠近区域中心的地方，与我们银河系中恒星和尘埃的颜色相呼应。
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This well-composed telescopic field of view covers over a Full Moon on the sky toward the high-flying constellation Pegasus. Of course the brighter stars show diffraction spikes, the commonly seen effect of internal supports in reflecting telescopes, and lie well within our own Milky Way galaxy. The faint but pervasive clouds of interstellar dust ride above the galactic plane and dimly reflect the Milky Way's starlight. Known as galactic cirrus or integrated flux nebulae they are associated with the Milky Way's molecular clouds. In fact, the diffuse cloud cataloged as MBM 54, less than a thousand light-years distant, fills the scene. The galaxy seemingly tangled in the dusty cloud is the striking spiral galaxy NGC 7497. It's some 60 million light-years away, though. Seen almost edge-on near the center of the field, NGC 7497's own spiral arms and dust lanes echo the colors of stars and dust in our own Milky Way.
© Robert Eder