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Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the current age of the universe. The table shows the lifetimes of stars as a ...
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars . Classification by spectral energy distribution [ edit ]
Stellar structure. Cross-section of the. Stellar structure models describe the internal structure of a star in detail and make predictions about the luminosity, the color and the future evolution of the star. Different classes and ages of stars have different internal structures, reflecting their elemental makeup and energy transport mechanisms.
Substellar object. A substellar object, sometimes called a substar, is an astronomical object, the mass of which is smaller than the smallest mass at which hydrogen fusion can be sustained (approximately 0.08 solar masses ). This definition includes brown dwarfs and former stars similar to EF Eridani B, and can also include objects of planetary ...
Manfred Cuntz is a German astrophysicist based in the United States since 1988. He is a Distinguished Professor of physics at the University of Texas at Arlington (UTA). His primary research interests include stellar astrophysics, astrobiology, and planetary habitability.
The following is a list of stars with resolved images, that is, stars whose images have been resolved beyond a point source. Aside from the Sun, observed from Earth, stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment and techniques to image.
Theoretical work in 1996 placed the limit at approximately 1.5 to 3.0 M ☉, corresponding to an original stellar mass of 15 to 20 M ☉; additional work in the same year gave a more precise range of 2.2 to 2.9 M ☉.
Georg Wilhelm Steller (10 March 1709 – 14 November 1746) was a German-born naturalist and explorer who contributed to the fields of biology, zoology, and ethnography.He participated in the Great Northern Expedition (1733–1743) and his observations of the natural world helped the exploration and documentation of the flora and fauna of the North Pacific region.