约塞米蒂瀑布上方的ZTF彗星
(原标题: Comet ZTF over Yosemite Falls)
2023-02-21
浏览次数: 27
它们都在下降。美国加利福尼亚州约塞米蒂瀑布的水正朝着地球落下。ZTF彗星正在向太阳坠落。这幅双宇宙级联图是上月底拍摄到的，当时正在褪色的彗星C/2022 E3 （ZTF）刚刚经过离地球最近的地方。瀑布上方的橙色星星是Kochab。除了与黑熊的短暂相遇外，这张特色照片是一个精心策划的合成图，包括月球前景和长时间的背景曝光——所有这些都是为了重建一个真实的单一景象的深层版本。虽然ZTF彗星现在在向外太阳系滑动的过程中逐渐消失，但它的路径是由引力决定的，所以它可以被认为仍然在向太阳下落——但是是向后的。彗星ZTF画廊：值得注意的提交给APOD
查看原文解释
They are both falling. The water in Yosemite Falls, California, USA, is falling toward the Earth. Comet ZTF is falling toward the Sun. This double cosmic cascade was captured late last month as fading Comet C/2022 E3 (ZTF) had just passed its closest to planet Earth. The orange star just over the falls is Kochab. With the exception of a brief encounter with a black bear, the featured image was a well-planned composite of a moonlit-foreground and long-duration background exposures - all designed to reconstruct a deep version of an actual single sight. Although Comet ZTF is now fading as it glides back to the outer Solar System, its path is determined by gravity and so it can be considered to still be falling toward the Sun -- but backwards. Comet ZTF Gallery: Notable Submissions to APOD
© Tara Mostofi