NASA 公开詹姆斯韦伯太空望远镜拍摄「天王星」图像

NASA 早先公开由韦伯太空望远镜拍摄到的全新「天王星」图像，此次拍摄的照片能够清楚看到天王星外围 13 个星环中的 11 个，过去只有 Voyager 2 探测器和 Keck 天文台成功捕捉，并且从未像韦伯望远镜如此清晰。

作为太阳系的第 7 颗行星，天王星的独一无二之处在于其侧面旋转的特性，与轨道平面大约成 90 度角，使得天王星有著极端的季节，星球两极处持续受到多年的阳光照射与相同时间的黑暗。目前天王星的北极正处于晚春，夏季将在 2028 年到来。

透过韦伯望远镜的 NIRCam（近红外线相机）所捕捉的清晰图像，展示了天王星大气层的动态，包括面对太阳的极点有一处变亮的区域，又称为极冠，似乎只在夏季极点被阳光照射时出现，并在秋季消失，这些数据都有助于科学家更加了解天王星。

除此之外，韦伯望远镜还拍摄到了已知天王星周围 27 颗卫星中最亮的 6 颗，有兴趣的读者不妨前往 NASA 官方页面了解更多资讯。

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