moderate-altitude orbit
11climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …
12Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
13Sun — This article is about the star. For other uses, see Sun (disambiguation). The Sun …
14Moon landing conspiracy theories — Astronauts Buzz Aldrin and Neil Armstrong in NASA s training mockup …
15mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …
16Scramjet — Part of a series on Aircraft propulsion Shaft engines (to drive pr …
17Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …
18Mars Observer — Artist rendering of Mars Observer in orbit around Mars. Operator NASA / JPL …
19Rocket engine — RS 68 being tested at NASA s Stennis Space Center. The nearly transparent exhaust is due to this engine s exhaust being mostly superheated steam (water vapor from its propellants, hydrogen and oxygen) …
20TWINS — This article is about the NASA instruments. For other uses of Twins , see Twins (disambiguation). TWINS Operator NASA Instrument Type …
