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Phenomena, 2007: September
For terms in boldface, see Astronomical Terms. Day Phenomenon Hour 3 Pallas, the second-largest asteroid…Visibility of Planets in Morning and Evening Twilight, 2008
Morning Venus Januar 1-May 10 Mars Jupiter January 8-July 9 Saturn January 1-…What Kind of Cloudy Is It?
Clouds are little drops of water or ice hanging in the atmosphere. A ceilometer measures the height of clouds. Cloud Descriptive Name Height Description Cirrus Mare's tails 4 miles…Top-Selling Vehicles in the U.S., 2006
Rank Vehicle Number 1. Ford F-Series 796,039 2. Chevrolet Silverado 636,069 3. Toyota Camry 448,445 4. Dodge Ram 364,177 5. Honda Accord 354,441 6…Chemical Elements Table
See the interactive periodic table.ElementSym-bolAtomicno.Atomicwt.SpecificgravityMeltingpoint °CBoilingpoint °CNo. ofisotopes1DiscovererYearActinium Ac 89 227210.0731051319811 Debierne/Giesel1899…Active Pilot Certificates Held
Year Total Airlinetransport Commercial Private 1970 720,028 31,442 176,585…Speed Around the World, Nonstop, Nonrefueled
Speed (mph) Date Plane Pilots Place115.65 Dec. 14–23, 1986 Voyager Dick Rutan & Jeana Yeager (U.S.) Edwards AFB, Calif.—Edwards AFB, Calif.Absolute World RecordsDistance, Great Circle…Distance, Great Circle Without Landing, also Distance, Closed Circuit Without Landing
Distance (mi) Date PlanePilots Place24,986.727 Dec. 14–23, 1986 VoyagerDick Rutan & Jeana Yeager (U.S.) Edwards AFB, Calif.—Edwards AFB, Calif.Speed Around the World, Nonstop,…Altitude Records
Height (ft) Date Plane typePilot Place123,523.58 Aug. 31, 1977 MIG-25, E-266M Alexander Fedotov (USSR) USSRSpeed over a Closed CircuitAbsolute World RecordsAltitude in Horizontal Flight…Altitude in Horizontal Flight
Height (ft) Date Pilot Place 85,068.997 July 28, 1976 Capt. Robert C. Helt (USAF) Beale AFB, Calif. Altitude Absolute World Records Altitude, Aircraft…Trending
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