WebA star is defined by nuclear fusion in its core. Before fusion begins, an object that will become a star is known as a young stellar object (YSO), and it passes through two major … WebA star forms from massive clouds of dust and gas in space, also known as a nebula. Nebulae are mostly composed of hydrogen. Gravity begins to pull the dust and gas …

Basics Stars – NASA Universe Exploration

WebAstronomers call stars that are stably undergoing nuclear fusion of hydrogen into helium main sequence stars. This is the longest phase of a star’s life. The star’s luminosity, size, … WebSep 26, 2024 · An artist's impression of the evolution of a Sun-like star, from its birth as a tiny protostar on the left, to its expansion into a red giant then a planetary nebula, on the right. (Image credit: ESA) rca family investmentsllc

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WebStar formation begins in relatively small molecular clouds called dense cores. Each dense core is initially in balance between self-gravity, which tends to compress the object, and … WebMost planetaries show a central star, called the nucleus, which provides the ultraviolet radiation required for ionizing the gas in the ring or shell surrounding it. Those stars are among the hottest known and are in a … WebHomework #4 1- Describe how a planetary nebula forms. Note the mass range of the progenitor stars. What other object to you expect to find associated with a planetary nebula? A asymptotic giant branch star (hot non-burning carbon core) is the progenitor. The carbon core gains enough mass that it ignites. This burst of energy heart the core and quenches … sims 4 lawn chair vintage tumblr