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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.
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 ...
The Andromeda Galaxy is known to harbor a dense and compact star cluster at its very center, similar to our own galaxy. A large telescope creates a visual impression of a star embedded in the more diffuse surrounding bulge. In 1991, the Hubble Space Telescope was used to image the Andromeda Galaxy's inner nucleus.
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 ...
In Meteorologica, Aristotle (384–322 BC) states that the Greek philosophers Anaxagoras (c. 500 –428 BC) and Democritus (460–370 BC) proposed that the Milky Way is the glow of stars not directly visible due to Earth's shadow, while other stars receive their light from the Sun, but have their glow obscured by solar rays. [65]
July 25, 2024 at 8:30 AM. Brooke Shields shared that “at a certain age” she “stopped sleeping.”. “It’s not for the faint of heart,” she said. Menopause can disrupt sleep in multiple ...
The Circinus Galaxy, a Type II Seyfert galaxy. Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies. They have quasar-like nuclei (very luminous sources of electromagnetic radiation that are outside of our own galaxy) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, [1] but unlike quasars, their ...