History <a href="http://stairlift-forum.co.uk/how-does-bacteria-become-resistant-to-tetracycline-3og4">tetracycline antibiotics acne treatment</a> The nebula was created by the star, which is losing part of its mass out into the surrounding space, forming a cloud of gas and dust as the material cools. The dust consists of elements such as carbon and simple, heat-resistant compounds such as titanium dioxide and calcium oxide (lime). In this case, detailed studies of the object in infrared light point to silicon dioxide (silica) being the most likely compound reflecting the star&#39;s light.