orbital replacement unit
51List of Mir spacewalks — A view of …
52space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …
53CryoSat-2 — undergoing testing in Germany Operator ESA Major contractors EADS Astrium ISC Kosmotras (LSP) …
54List of Mobile Suit Gundam Wing mobile weapons — This is a list of mobile units featured in the Japanese anime television series Mobile Suit Gundam Wing, known in Japan as New Mobile Report Gundam W (新機動戦記ガンダムＷ, Shin Kidō Senki Gandamu Uingu?), and subsequent spin offs. Contents …
55List of Gaunt's Ghosts characters — This list is of characters featured in the Gaunt s Ghosts series of novels by Dan Abnett, which are set in the fictional Warhammer 40,000 universe. Biographical details are included. Ghosts Colonel Commissar Ibram Gaunt AliveColonel Commissar… …
56chemical bonding — ▪ chemistry Introduction any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …
57Chemical reaction — Chemical reactions redirects here. For the 2007 television episode, see Chemical Reactions (Men in Trees). A thermite reaction using iron(III) oxide. The sparks …
58List of minor Star Wars droids — This article is about minor droids in the fictional Star Wars universe. It includes specific droids units, examples of those within the Star Wars universe, and some minor droid types, but not examples such as protocol droids and battle droids.2… …
59London Borough of Croydon — For other places called Croydon, see Croydon (disambiguation). For the historic town located within the London Borough which gives the name, see Croydon. London Borough of Croydon   London borough   …
60heterocyclic compound — Any of a class of organic compounds whose molecules contain one or more rings of atoms with at least one atom (the heteroatom) being an element other than carbon, most frequently oxygen, nitrogen, or sulfur. As in regular cyclic hydrocarbons,… …
