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Phenomena, 2007: November

For terms in boldface, see Astronomical Terms. Day Phenomenon Hour 1 Mercury appears to be motionless in…

Phenomena, 2007: October

For terms in boldface, see Astronomical Terms. Day Phenomenon Hour 2 Mars is 5° south of the Moon. 2000…

Phenomena, 2007: September

For terms in boldface, see Astronomical Terms. Day Phenomenon Hour 3 Pallas, the second-largest asteroid…

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…

Chemical Elements Table

See the interactive periodic table.ElementSym-bolAtomicno.Atomicwt.SpecificgravityMeltingpoint °CBoilingpoint °CNo. ofisotopes1DiscovererYearActinium Ac 89 227210.0731051319811 Debierne/Giesel1899…

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…