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Density wave theory or the Lin–Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid-1960s to explain the spiral arm structure of spiral galaxies. [ 1][ 2] The Lin–Shu theory introduces the idea of long-lived quasistatic spiral structure (QSSS hypothesis). [ 1] In this hypothesis, the spiral pattern rotates with ...
Only two or three fringes can normally be observed. Young used this formula to estimate the wavelength of violet light to be 400 nm, and that of red light to be about twice that – results with which we would agree today. In the years 1803–1804, a series of unsigned attacks on Young's theories appeared in the Edinburgh Review.
An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the four 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. Elliptical (E) galaxies are, together ...
In astronomy, a galactic bulge (or simply bulge) is a tightly packed group of stars within a larger star formation. The term almost exclusively refers to the central group of stars found in most spiral galaxies (see galactic spheroid ). Bulges were historically thought to be elliptical galaxies that happened to have a disk of stars around them ...
Famous tattoo artist, Scott Campbell, offered strangers free tattoos in his new project, Whole Glory...there was just one catch.
BDSM is a variety of often erotic practices or roleplaying involving bondage, discipline, dominance and submission, sadomasochism, and other related interpersonal dynamics. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves to be practising BDSM, inclusion in the BDSM community or ...
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, [27] their demise tends to leave a darker background of fainter stars immediately behind the density waves. This make the density waves much more prominent.
Sitting in the noisy dayroom of Mule Creek State Prison in Ione, Calif., as he speaks over a grainy video call, Scott Peterson looks more like a laidback surfer than a man convicted of the heinous ...