sublimation nucleus
1precipitation — /pri sip i tay sheuhn/, n. 1. the act of precipitating; state of being precipitated. 2. a casting down or falling headlong. 3. a hastening or hurrying in movement, procedure, or action. 4. sudden haste. 5. unwise or rash rapidity. 6. Meteorol. a …
2Comet Hale–Bopp — C/1995 O1 (Hale–Bopp) Discovery Discovered by: Alan Hale and Thomas Bopp Discovery date: July 23, 1995 Alternate designations: The Great Comet of …
3rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
4Comet Holmes — 17P/Holmes Comet Holmes on November 4, 2007, showing the blue ion tail on the right, taken from Hungary Discovery Discovery date: November 6, 1892 Alternate designations: 1892 V1; 1892 III; 1892f; 1899 L1; 1899 II; 1899d; …
5Comète Hale-Bopp — Traduction à relire Comet Hale Bopp → …
6Martian geyser — Artist concept showing sand laden jets erupting from Martian geysers. (Published by NASA; artist: Ron Miller.) …
7comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …
8chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… …
9Glossary of chemistry terms — This page is a glossary of chemistry terms. Chemistry has an extensive vocabulary and a significant amount of jargon. This is a list of chemical terms, including laboratory tools, glassware, and equipment. Chemistry itself is a physical science… …
10Extinct comet — Don Quixote (apmag 15) near perihelion in 2009. Extinct comets are comets that have expelled most of their volatile ice and have little left to form a tail or coma. The volatile material contained in the comet nucleus evaporates away, and all… …
