A nebula is a giant cloud of dust and gas in space. Some nebulae more than one nebula come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.
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Space is big! Science is cool! Though the center is currently closed, we are still passionate about science and space exploration. A nebula is an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars. They either form through clouds of cold interstellar gas and dust or through the aftermath of a supernova. For example, in the Carina Nebula, hot, young stars erode and sculpt the clouds into this fantasy landscape by sending out thick stellar winds and scorching ultraviolet radiation.
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Classes of nebulae
The term was formerly applied to any object outside the solar system that had a diffuse appearance rather than a pointlike image, as in the case of a star. This definition, adopted at a time when very distant objects could not be resolved into great detail, unfortunately includes two unrelated classes of objects: the extragalactic nebulae, now called galaxies , which are enormous collections of stars and gas, and the galactic nebulae, which are composed of the interstellar medium the gas between the stars, with its accompanying small solid particles within a single galaxy. Today the term nebula generally refers exclusively to the interstellar medium. Much of the rest of the mass within a galaxy is concentrated in visible stars, but there is also some form of dark matter that accounts for a substantial fraction of the mass in the outer regions.