Nebula

Nebula nebula什么意思? Orion nebula in brilliant是什么意思 nebula与nebulae的区别是什么?如题, nebula,cluster,globular cluster,galaxy,supercluster哪个范围大,定义是什么?特点~ 猎户座大星云To the eye (through a telescope),much of the Orion Nebula looks like a glowing cloud of gas.What type of spectrum would you expect to see from the glowing parts of the nebula?Why? 天文,观测星云,我们得到星云是哪种光谱?What type of spectrum would you expect to see from the glowing parts of the nebula?Why? 帮忙翻译一个句子（服装类的）Please help to confirm the following for SS07G upon receipt -* FH07M0847 - Chevelle Geo* Resubmit of all colour's strike off, when are you sending this for ourreview?* FH07M0856 - Nebula Stripe* When are you 英语翻译a pulsar is a celestial object that emits llight in short burst a pulsar in the crab nebula flashes at a rate of 30 times/s,suppose the light pulses are caused by the rotation of a spherical object that emits light from a pair of diametri 英语翻译a pulsar is a celestial object that emits light in short burst a pulsar in the crab nebula flashes at a rate of 30 times/s,suppose the light pulses are caused by the rotation of a spherical object that emits light from a pair of diametric 英语翻译This model also explains most of the large moons of the jovian planets.The same processes of heating,spinning,and flattening that made the disk of the solar nebula should also have affected the gas drawn by gravity to the young jovian pla 谁能帮我解决下这个问题（英语）英语中有这样的单词：cacti--仙人掌 是cactus的复数形式； nebulae--星云 是nebula的复数形式请问象这样的词还有哪些?常规的加S、ES、IES…的那些就不用说了