Misty shapes in Space
In space, between the stars, there are big patches of gas or dust, or both. These are called nebulas or nebulae. Nebulas come from the Latin word for cloud.
There are four kinds of nebulas. One kind seems to glow because it reflects the light from nearby stars. This kind of nebula is made of gas and dust and is called a reflective nebula.
Other nebulas are collections of dust, gas, and special gases that give off their own light. They are called emissions nebulas.
Other nebulas are collections of cloudy dust and gas that often block the stars behind them or make these stars difficult to see. These are called dark nebulas.
Planetary nebulas have a flat, rounded surface like a planet. They are shells of gas that usually surround a star that has exploded.
Picture Credit : Google
