A Nebulae is a cloud of dust and gas inside a galaxy. Nebula become visible if the gas close or is the cloud reflect starlight or obscures light from more distant objects. Emission nebulous Shine because there gas emits light when it is stimulated by radiation from hot young stars. Reflection nebulae Shine because there does reflects light from Star ine for around the nebula. Dark nebula appeared as silhouettes because they blocked out light from shining nebulae or stars behind them to types of nebula are associated with dying stars planetary nebulae and Supernova remnants full stop both consist of expanding shells of gas that were once the outer layers of a star. A planetary nebula is a gas shell drifting away from a dying Stellar core. A supernova remnant is a gas shell moving away from a Stellar core at great speed following a violent explosion called a supernova full stops are soft and found in groups known as clusters. Open clusters are loose group of a few thousand young stars that were born from the same cloud and are different apart. Globular clusters are densely packed the comma roughly spherical groups of hundreds of thousands of oldest stars.
Some of the nebulae and star clusters are given below
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