Definition of efficiency in the AudioEnglish.org Dictionary. Meaning of efficiency. What does efficiency mean? Proper usage and pronunciation (in phonetic transcription) of the word efficiency. Information about efficiency in the AudioEnglish.org dictionary, synonyms and antonyms.
This article is about the star. For other uses, see Antares (disambiguation). Antares (/Ã¦nËtÉËriËz/), also designated Alpha Scorpii (Î± Scorpii, abbreviated Alpha Sco, Î± Sco), is on average the fifteenth-brightest star in the night sky, the brightest star in the constellation of Scorpius.
That's our old friend, Antares, a supergiant star, 700 times the Sun's diameter, large enough to engulf even the orbit of Mars, if the solar system were centered on it. Antares itself is relatively cool as stars go; only 6,000 to 7,000 degrees Fahrenheit compared with 11,000 degrees for the Sun. Its low temperature accounts for its ruddy color. It's at least 17,000 times as luminous as the Sun, yet less than one-millionth in overall density.