"Orion Nebula". The Great Nebula, also called the Orion Nebula, is a wonderful star nursery that is visible to the naked eye under a dark sky. The swirls of nebulosity spread out from its core of the four stars called the Trapezium, which power the nebula.
The Latin word for cloud, nebula, is the term used for the cosmic gas and dust that lie among the stars. Most nebulae are lit up by light from stars within them. The biggest nebulae do not shine at all. They can be only seen when they block the light of more distant stars.