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This color comes from the hot hydrogene gas which is excited to shine by the hottest stars which have just formed within the nebula . Open-fronted Class I and Class II biological safety cabinets are the primary barriers which offer significant levels of protection to laboratory personnel and to the environment , when used with good microbiological techniques . To put this statement in other words , unlike many testing methods , the X-machine one puts down all assumptions which are made . This phenomenon affects dramatically the abundance of carbon and nitrogen ( and even sometimes sodium ) in the atmosphere of the stars and , as a consequence the abundance of these elements in the pristine gas of the Galaxy can be deduced only from less evolved " unmixed " old stars which have not undergone " extra-mixing " . We will test the possibility that we are observing gas from an early burst of massive star formation such as population III halo stars which would have produced some S and O but not a significant amount of the secondary element N that is also produced from low mass stars . Australia includes three Australian Studies offerings which encourage students to explore issues associated with Australian society and culture . This objection is based on an overestimation of the variety of sounds which children of the ages in question make . The blue stars in the arms are young hot and massive stars which formed recently from density perturbations caused by interactions with neighboring galaxies which are lying just outside our image . The youngest and most compact , named N88A ( diameter of 3.5 second of arc , corresponding to approximately 3 light-years ) , is generated by massive stars which have just been born .