rnova 1994D Another possible explanation for the contraction that is occurring at this time is due to shockwaves from surround supernovas. (Kippenhahn, 1994) At this point the contracted interstellar clouds are called Bok globules. Globules are usually a few light years in size and they are made up of hydrogen and dust. At some point, however, a significant amount of energy goes into dissociating molecular hydrogen to form atomic hydrogen; later more energy is needed to ionize all chemical species. Basically after this the cloud doesnt have a whole lot of energy left and it starts to contract even more. During this time around the particles that make up the cloud have been getting even hotter and have been giving off more visible light and less infrared Dark Bok Globules in IC 2944 radiation. Because it is cooler dust in the surrounding stellar nebula out of which the star is forming, it absorbs photons, heats up, and gives off energy as infrared radiation. As the star cools it also starts to spin much more rapidly. So, the stellar nebula hides the baby star until most of the surrounding gas and dust in the nebula is either attracted to it or blown away by it.(Goldberg, 1982) Eagle Nebulaformed by forming stars During the next step of star formation the spin, pressure, and temperature inside the interstellar cloud continue to increase. Due to these increases the Bok Globules will split into the protoplanetary disk and the central core. The protoplanetary disk has the potential to actually change form and become planets. On the other hand, the central core will go on to become one of those loveable pin pricks of light in the sky that we call stars. (Strobel, Unknown) During the next step of stellar birth, the core continues to increase in temperature and when the forming star has stabilized itself, then it has become a protostar. The temperature of a protostar's surface is about 4000 K, and energy in its deep interior is transported to t...
