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Spiral arms appear visually brighter because they contain both young stars and more massive and luminous stars than the rest of the galaxy. As massive stars evolve far more quickly, [30] their demise tends to leave a darker background of fainter stars immediately behind the density waves. This make the density waves much more prominent.
Population I stars are young stars with the highest metallicity out of all three populations and are more commonly found in the spiral arms of the Milky Way galaxy. The Sun is considered as an intermediate population I star, while the sun-like μ Arae is much richer in metals. [17] (The term "metal rich star" is used to describe stars with a ...
As clumps of gas aggregate forming rotating disks, temperatures and pressures continue to increase. Some places within the disk reach high enough density to form stars. Artist impression of a young galaxy accreting material. Once protogalaxies began to form and contract, the first halo stars, called Population III stars, appeared within them. [184]
In a galaxy far, far away from any known celestial object, a young star is going through a tremendous yet incredibly lonely growth spurt -- much like you did in middle school.
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
NGC 602c is a looser grouping 11 arc-minutes to the NE, which includes the WO star AB8. [9] NGC 602 includes many young O and B stars and young stellar objects, with few evolved stars. [10] Ionisation in the nebula is dominated by Sk 183, an extremely hot O3 main sequence star visible as the bright isolated star at the centre of the Hubble ...
The presence of young, bright stars in this region has the effect of influencing the surrounding interstellar medium. For instance, a supernova explosion generates a shockwave in the gas, thereby facilitating the spread of star formation across the galactic disk. [ 48 ]
The giant elliptical galaxy ESO 325-4. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, [1] along with spiral and lenticular galaxies.