Nebulae usually consist of Hydrogen and Helium, as these are the most common and stable compounds in theUniverse. The formation of a nebula can occur when a star undergoes a significant change, such as excess fusion in its core. In the case of a planetary nebula, the formation of this dee...
Data Size: Six matrices of size 35-by-41-by-15 load wind.mat Image Data FilenameDescriptionHow to Load ngc6543a.jpg This NASA Hubble Space Telescope image shows one of the most complex planetary nebulae ever seen, NGC 6543, nicknamed the "Cat's Eye Nebula." Hubble reveals surprisingly in...
We present aperture synthesis images of the HCN J=1-0 emission line toward the proto-planetary nebula CRL 2688 (the "Egg Nebula"). The images were obtained... JH Bieging,N Q.-Rieu - 《Astronomical Journal》 被引量: 26发表: 1996年 Introduction of a Simplified round Partogram in Rural ...
A nebula or other starlike object may also be called afixedstar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The statement that "the system of fixed stars" is free of rotation may retain a relative meaning, which is to be fixed by a compa...