What are Nebulas in the Universe
103Nebulae are large clouds spread across interstellar space (the areas between stars). They are formed, above all, of cosmic dust and gases, such as hydrogen (approximately 75%) and helium (approximately 25%). For many centuries, they were considered galaxies, until the evolution of astronomy studies managed to categorize them separately.
Some of them are born from the explosion of massive stars that are at the end of their life cycles. This explosion, called a supernova, ejects stellar matter in all directions, giving rise to one or more nebulae, which can have different shapes and sizes.
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