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Stellar evolution is the process by which a star changes over the course of time, driven by nuclear fusion and gravitational forces. It encompasses a star's birth from a molecular cloud, its main sequence life, and its eventual death, which can lead to a supernova, white dwarf, neutron star, or black hole, depending on its initial mass.
Stellar formation is the process by which dense regions within molecular clouds in interstellar space collapse to form stars, driven by gravitational forces and often influenced by external factors like supernovae. This process involves a complex interplay of physics including nuclear fusion, angular momentum conservation, and magnetic fields, ultimately leading to the birth of stars that can vary widely in mass and life span.
Star formation regulation refers to the processes and mechanisms that control the rate and efficiency of star formation in galaxies, influenced by factors such as gas availability, feedback from stars, and galactic dynamics. Understanding these regulatory processes is crucial for explaining the observed diversity in star formation rates across different galaxies and cosmic epochs.
Concept
Protostars are the earliest stage in the formation of a star, where a dense region within a molecular cloud collapses under gravity, eventually igniting nuclear fusion in its core. These objects are characterized by their rapid accretion of material and are often surrounded by a circumstellar disk that may lead to planet formation.
Concept
A protostar is an early stage in the formation of a star, where a dense region within a molecular cloud collapses under gravity, leading to the accumulation of mass and the onset of nuclear fusion. This phase is critical as it determines the initial mass and evolutionary path of the star, influencing its eventual fate in the stellar lifecycle.
Concept
Nebulae are vast clouds of gas and dust in space, often serving as the birthplace of stars and planetary systems. They can be seen in various forms, such as emission, reflection, and dark nebulae, each with unique characteristics and roles in the cosmic cycle of matter.
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