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α Scorpii, a cool supergiant star of spectral type M1Ib, whose red color stands out in the midsummer sky. With an effective temperature of approximately 6000°F (3600 K), Antares resembles Betelgeuse, the brightest of the red supergiants, and would…

Any of several living mammals in the suborder Vermilingua in the order Pilosa that feed on ants and termites. The common name of anteater is assigned to four species of living mammals classified in the suborder Vermilingua in the order Pilosa…

The name given to a group of African and Asian hoofed ruminants of the order Artiodactyla. The 91 species in 31 genera are divided into five subfamilies (Bovinae, Cephalophinae, Hippotraginae, Antilopinae, and Caprinae) in the family Bovidae. The…

The device that couples the transmitter or receiver network of a radio system to space. Radio waves are used to transmit signals from a source through space. The information is received at a destination which in some cases, such as radar, can be…

A class of phylum Cnidaria (formerly known as Coelenterata) whose members are marine, live exclusively as polyps, and occur as solitary individuals or in clonal or colonial groups. Most adult anthozoans are attached to a firm object or the sea…

An order of cnidarians (subclass Hexacorallia) commonly known as black, or thorny, corals. Antipatharians have been identified in all of the world's oceans at depths of 4 to 8600 m (13 to 28,200 ft), but most known species live between 100 and 1000…

All measures required to combat enemy submarines, including strategy, operational employment of forces, tactics, and a wide variety of equipment and weapons to find and destroy submarines and to neutralize their weapons. Goals The key physical facts…

One of the three living orders of the class Amphibia, encompassing the frogs and toads. Because members of the order Anura (anurans) lack a tail, they differ most obviously from salamanders (order Urodela; also called Caudata). Usually, frogs and…

Any of the vermiform (wormlike) marine mollusks covered by a cuticle invested with innumerable calcareous scales or spines (sclerites) forming a scleritome. There are two groups that together are known as the Aplacophora: (1) Chaetodermomorpha or…

The smallest order of the class Amphibia, consisting of the wormlike caecilians. The order Apoda is sometimes called Gymnophiona. Its members are known commonly as caecilians, which are wormlike, legless amphibians with indistinct or even hidden…