Star struck. (Letters).I am surprised at the matter-of-fact sounding statements in "Cosmic Remodeling remodeling /re·mod·el·ing/ (re-mod´el-ing) reorganization or renovation of an old structure. bone remodeling : Superwinds star in early universe" (SN: 4/20/02, p. 244): "Dark matter reacts only to gravity. Unlike visible matter, it can't be pushed by winds." We hypothesize hy·poth·e·size v. hy·poth·e·sized, hy·poth·e·siz·ing, hy·poth·e·siz·es v.tr. To assert as a hypothesis. v.intr. To form a hypothesis. the existence of dark matter to explain observations that could be attributed to gravitational grav·i·ta·tion n. 1. Physics a. The natural phenomenon of attraction between physical objects with mass or energy. b. The act or process of moving under the influence of this attraction. 2. forces, but we don't know Don't know (DK, DKed) "Don't know the trade." A Street expression used whenever one party lacks knowledge of a trade or receives conflicting instructions from the other party. what dark matter might be. How can one say that it reacts only to any one force and that it can't be pushed by winds? CLINTON C. BROOKS, ANNAPOLIS, MD. Scientists can't be sure that any particular form of dark matter exists until they detect it, but if properties of dark matter were very different than envisioned, the arrangement of galaxies wouldn't be as it is today.--R. COWEN |
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