(Encyclopedia) Arecibo Observatory, radio-astronomy facility located near Arecibo, Puerto Rico, part of the National Astronomy and Ionosphere Center. Conceived by, designed by, and built under the…
(Encyclopedia) geodegeodejēˈōd [key], hollow, globular rock nodule ranging in diameter from 1 to 12 in. (2.54–30.5 cm) or more. Most geodes are partly filled with mineral matter; they have a thin…
(Encyclopedia) Epimetheus, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XI (or S11), Epimetheus is an irregularly shaped (nonspherical) body measuring…
(Encyclopedia) antiseptic, agent that kills or inhibits the growth of microorganisms on the external surfaces of the body. Antiseptics should generally be distinguished from drugs such as antibiotics…
(Encyclopedia) Bond, George Phillips, 1825–65, American astronomer, b. near Boston, grad. Harvard, 1845. He became the assistant of his father, William Cranch Bond, and in 1859 succeeded him as…
latitude lines Imaginary lines running horizontally around the globe. Also called parallels, latitude lines are equidistant from each other. Each degree of latitude is about 69 miles (110 km)…
The Faster You Go, the Shorter You GetTheories of the UniverseCracks in a Newtonian WorldFaster Than a Speeding Light WaveIt All Depends on Your PositionThe Relative Nature of Space and…
Source: National Institute of Standards and Technology Physics Laboratory Not until somewhat recently (that is, in terms of human history) did people find a need for knowing the time of day. As…
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Do you need to figure out how many cups are in a liter? Do you need to…
