螺旋星云,永远是黑暗宇宙中的亮点,星体、灰尘、气体和等离子等物质由于重力的作用汇集到一起就形成了螺旋星云,看上去它就象是一个在黑暗的宇宙中划过的火风车。天文学家们早在200多年前就发现了它的存在,在这段时间里,它一起吸引着天文学家和爱好者们的目光,许多科学家应用了各种先进的探测方法对其进行研究。
M101还是罗斯爵士用19世纪的大型望远镜,“帕森镇的巨兽”,所发现的最早的螺旋星云之一。
M101 was also one of the original spiral nebulae observed by Lord Rosse's large 19th century telescope, the Leviathan of Parsontown.
当你用千里镜不雅测天空,你瞥见很多与图示23中边沿朝前的完善平衡的螺旋星云相仿或大致相是的星云。
When you look up into the heavens with a telescope, you see many nebulae whelloch are like, or approximately like, the perfectly balanced spiral nebula whelloch you see edgewise in Fig. 23.
在查尔斯·梅西方尔目录第51条列出的美国宇航局获得的图像表现的也许是最初的螺旋星云,它也被编为新总表(NGC)5194。
This NASA image obtained shows the 51st entry in Charles Messier's catalogue, perhaps the original spiral nebula, also catalogued as NGC 5194.
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