Copyright:
Ian Moehring & Kevin Roylance
中文翻譯:
在星空中，有一片叫做Great Lacerta Nebula（大蜥蜴星雲）的發光雲朵。雖然它和仙女座星系一樣大，但大家卻不太知道它。這個星雲位於蜥蜴座的星空中，真的很難用雙筒望遠鏡看到，因為它非常微弱。而用大望遠鏡也可能很難捕捉，因為它的面積非常廣，佔據了大約三度的天空。要欣賞這個星雲的深度、寬度和美麗，最好是用長時間曝光的相機來拍攝。這是一張在美國華盛頓州摩西湖拍攝的照片，攝影者在三個晚上拍攝的，背景是黑暗的星空。Great Lacerta Nebula中的氫氣因為受到了明亮的恆星10 Lacertae的光刺激而發出紅色的光，這顆星就在星雲中心的左邊。大多數的星星和這個星雲距離我們大約有1,200光年遠。
原文:
It is one of the largest nebulas on the sky — why isn’t it better known? Roughly the same angular size as the Andromeda Galaxy, the Great Lacerta Nebula can be found toward the constellation of the Lizard (Lacerta). The emission nebula is difficult to see with wide-field binoculars because it is so faint, but also usually difficult to see with a large telescope because it is so great in angle — spanning about three degrees. The depth, breadth, waves, and beauty of the nebula — cataloged as Sharpless 126 (Sh2-126) — can best be seen and appreciated with a long duration camera exposure. The featured image is one such combined exposure — in this case taken over three nights in August through dark skies in Moses Lake, Washington, USA. The hydrogen gas in the Great Lacerta Nebula glows red because it is excited by light from the bright star 10 Lacertae, one of the bright blue stars just to the left of the red-glowing nebula’s center. Most of the stars and nebula are about 1,200 light years distant. Jigsaw Universe: Astronomy Puzzle of the Day
來源:NASA每日圖片
