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clusters or smaller, looser groups. As the cloud collapses, it becomes denser and heats up. Any random motion in the initial cloud builds up until it becomes a spinning, flattened disk. More and more material is swept up by the gravity of the central part of the cloud, called a protostar, which heats up to the point where it begins to glow. Its core becomes denser and hotter, until it reaches the point where nuclear fusion reactions can begin, and it has truly become a star.

adolescent stars

Young stars are still surrounded by a large cloud of gas and dust. Some of this will spiral into the star itself, but often just as much will be ejected. Many young stars develop a magnetic field that traps material and spits it out in jets from the poles. The pressure of strong stellar winds of charged particles star-forming nebulae

Some of the sky's outstanding emission nebulae are listed below. Since star formation is associated with our galaxy's spiral arms, it is unsurprising that the finest star-forming nebulae are scattered along the length of the Milky Way.

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