NGC 6995：蝙蝠星云
(原标题: NGC 6995: The Bat Nebula)
2024-09-04
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你能看见那只蝙蝠吗？它萦绕在东面纱星云的宇宙特写中。面纱星云本身是一个巨大的超新星遗迹，是一颗大质量恒星死亡爆炸后不断膨胀的碎片云。虽然面纱的形状大致是圆形的，并且覆盖了朝向天鹅星座（天鹅座）的天空近3度，但NGC 6995，非正式地称为蝙蝠星云，只覆盖了1/2度，大约是月球的视大小。根据面纱的估计距离，这相当于12光年，距离地球1400光年。在通过窄带滤光片记录的合成图像数据中，残留物中氢原子的发射显示为红色，而氧原子的强发射显示为蓝色色调。当然，在面纱的西部还有另一个季节性的幽灵：女巫的扫帚星云。教师和学生：在课堂上使用APOD的想法
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Can you see the bat? It haunts this cosmic close-up of the eastern Veil Nebula. The Veil Nebula itself is a large supernova remnant, the expanding debris cloud from the death explosion of a massive star. While the Veil is roughly circular in shape and covers nearly 3 degrees on the sky toward the constellation of the Swan (Cygnus), NGC 6995, known informally as the Bat Nebula, spans only 1/2 degree, about the apparent size of the Moon. That translates to 12 light-years at the Veil's estimated distance, a reassuring 1,400 light-years from planet Earth. In the composite of image data recorded through narrow band filters, emission from hydrogen atoms in the remnant is shown in red with strong emission from oxygen atoms shown in hues of blue. Of course, in the western part of the Veil lies another seasonal apparition: the Witch's Broom Nebula. Teachers & Students: Ideas for using APOD in the classroom
© Mike Taivalmaa