red shift of spectral lines
21redshift — [red′shift΄] n. Astron. the shift of spectral lines toward the longer wavelengths and lower frequencies at the red end of the spectrum in a luminous celestial body, indicating that the light source is moving rapidly away from the observer:… …
22Andromeda-Milky Way collision — The Andromeda Milky Way collision is a predicted galaxy collision, due to take place in approximately three billion years time, between the two largest galaxies in the Local Group, the Milky Way and the Andromeda GalaxyHazel Muir,… …
23redshift — /red shift /, n. Astron. a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth. Also, red shift. Cf. cosmological redshift, Doppler effect, gravitational… …
24cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …
25spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
26star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …
27Visible spectrum — White light is dispersed by a prism into the colors of the optical spectrum. The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye …
28Binary star — For the hip hop group, see Binary Star (band). Hubble image of the …
29Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
30Introduction to quantum mechanics — This article is an accessible, non technical introduction to the subject. For the main encyclopedia article, see Quantum mechanics. Quantum mechanics …
