One of the most famous nebulae, the Horsehead Nebula (pictured right), is named for its resemblance to a horse's head due to a thick cloud of dust accidentally obscuring the bright nebula. This is similar to how clouds on Earth may coincidentally resemble animals, and over the course of thousands of years, the cloud's shape will change as it moves. Both the Horsehead Nebula and the Flame Nebula (pictured left) appear to have an orange hue. The orange color occurs when electrons combine with protons to form hydrogen atoms.
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