After the protostar phase, the life cycle of an average star starts with a yellow dwarf phase. The Sun is an example of a yellow dwarf, also known as a main-sequence star. When a star begins its main sequence life, it is fusing hydrogen to helium within the core. Throughout the life...
A protostar may go through this sequence many times before the accretion disk and surrounding cloud are dispersed. Radiation from the star on to the disk during this intense stage of activity could be partially responsible for volatile depletions in the inner solar system (Bell et al., 2000),...
What is the smallest mass a newborn star can have? Stars: Stars are enormous spheres of plasma located in space. Main sequence stars are stars in the middle stage of their life and they are converting hydrogen atoms into helium atoms. This process is called nuclear fusion. ...
When does a protostar become a main-sequence star? How does a protostar become a star? Who started the space program? What is VY Canis Majoris made of? What was the first extrasolar planet discovered? Where are newly formed stars found in a spiral galaxy? What are planetary systems made ...
Eruptive young stellar objects form a small, but spectacular class of pre-main sequence stars where accretion from the circumstellar disk onto the star is ... B Egf 被引量: 0发表: 0年 Infrared spectro-interferometry of YSOs The latest generation of infrared long-baseline interferometric instrume...
Sirius is a binary star system made up of two stars, Sirius A and Sirius B. Facts About Sirius:Sirius is a two-star system at a distance of 8.6 light-years from Earth. It consists of the main sequence star Sirius A and a smaller dwarf companion Sirius B. Sirius B is the closest ...
A white dwarf star gets its color from the intense heat on the surface of the star. Unlike white stars during their main sequence phase of life, the heat of a white dwarf is the residual energy from the supernova that formed the white dwarf rather than nuclear fusion in its core....
How hot is the penumbra of a sunspot? How does Earth retain its atmosphere? What is its total energy at atmosphere entry? Describe the changes in the way stars undergo nuclear fusion as they age. What happens when a main-sequence star exhausts its core hydrogen fuel supply? ...
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Why does chemical composition change most rapidly in the center of a star? Why does nuclear fusion in the sun only occur near the center? Why do we have a mass hierarchy of leptons and quarks? Why do neutron stars rotate more rapidly than main-sequence stars? Why does helium ...