Astronomy Picture of the Day——布满尘埃的七姐妹
Seven Dusty Sisters
Image Credit: WISE, IRSA, NASA; Processing& Copyright : Francesco Antonucci
Explanation: Is this really the famousPleaides star cluster? Known for its iconic blue stars, the Pleaides is shownhere in infrared light where the surrounding dust outshines the stars. Herethree infrared colors have been mapped into visual colors (R=24, G=12, B=4.6microns). The base images were taken by NASA's orbiting Wide Field InfraredSurvey Explorer (WISE) spacecraft. Cataloged as M45 and nicknamed the SevenSisters, the Pleiades star cluster is by chance situated in a passing dustcloud. The light and winds from the massive Pleiades stars preferentially repelssmaller dust particles, causing the dust to become stratified into filaments,as seen. The featured image spans about 20 light years at the distance of thePleiades, which lies about 450 light years distant toward the constellation ofthe Bull (Taurus).
布满尘埃的七姐妹
这真的是那个著名的昴星团吗？昴星团以其标志性的蓝色恒星而闻名，但在这幅拍摄于红外光下的照片中，周围的尘埃让恒星瞬间失色。在这里三种红外色被映射成可视色彩（R=24，G=12，B=4.6微米）。这些基础影像是由NASA的广域红外巡天探测器（WISE）所拍摄的。编录号为M45，被昵称为七姐妹的昴星团是偶然出现在这团飘过的尘埃云中。如图所示，来自昴星团大质量恒星的强光和恒星风优先驱散较小的尘埃颗粒，从而使其变成分层的丝状尘埃。以昴星团的距离来计算，这幅照片跨度的距离约20光年，它位于金牛座方向，距离我们地球大约450光年。
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Astronomy Picture of the Day——梅西耶2星云