what is nebula?
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Meghna Thapar 5 years, 7 months ago
In essence, a nebula is formed when portions of the interstellar medium undergo gravitational collapse. ... From this, stars may form in the center of the collapsing material, who's ultraviolet ionizing radiation causes the surrounding gas to become visible at optical wavelengths. 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. For this reason, some nebulae are called "star nurseries."
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