One form of these objects has a bright emission spectrum at 500.7 nanometers which is the result of electrons in oxygen and nitrogen inhabiting excited metastable stables to form so called "forbidden lines". The remnant of th
One form of these objects has a bright emission spectrum at 500.7 nanometers which is the result of electrons in oxygen and nitrogen inhabiting excited metastable stables to form so called "forbidden lines". The remnant of that object will form a white dwarf. There are diffuse and planetary forms of these objects, including the Cat's Eye and Horsehead varieties. The picture "The Pillars of Creation" shows the Eagle one, while another one was formed following a supernova observed by Chinese astronomers in 1054 AD. For 10 points, name these interstellar clouds of dust and gas which include one named Crab.
One form of these objects has a bright emission spectrum at 500.7 nanometers which is the result of electrons in oxygen and nitrogen inhabiting excited metastable stables to form so called "forbidden lines".
{nebula}