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	gegenschein gegenschein or counterglow, a slight brightening of the night sky in the region of the zodiac directly opposite the sun, i.e., 180° from the sun. Discovered by the Danish astronomer Theodor Brersen in 1854, its nature and cause are still unknown. It may be caused by reflection of sunlight... Read more
	Magellanic Clouds Magellanic Clouds , two dwarf galaxies located in the far southern sky and visible to the unaided eye; they are classified as irregular because they show no definite symmetry or nucleus. The larger of the two, known as the Large Magellanic Cloud (LMC), is located mostly in the constellation Dorado;... Read more
	aurora borealis aurora borealis and aurora australis , luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aurora australis of the Southern Hemisphere is known as the southern lights. Each is visible over... Read more
	Macadamia Nut Macadamia Nut Background In the world of nuts and berries, macadamia nuts are almost as precious as gold. These delicious, exotic nuts with their rich flavor and oil are considered delicacies and are served as dessert nuts. They are popular gifts at holiday times, both alone... Read more
	airglow airglow faint diffuse illumination of the night sky originating in the upper atmosphere. The energy in the form of visible light is derived from the sun's ultraviolet light, which ionizes atoms and dissociates molecules at heights between 40 and 200 mi (64-322 km) above the earth's surface. When... Read more
	Cepheid variables Cepheid variables , class of variable stars that brighten and dim in an extremely regular fashion. The periods of the fluctuations (the time to complete one cycle from bright to dim and back to bright) last several days, although they range from 1 to 50 days. These stars are important because the... Read more
	soap soap a cleansing agent. It cleanses by lowering the surface tension of water, by emulsifying grease, and by absorbing dirt into the foam. Ancient peoples are believed to have employed wood ashes and water for washing and to have relieved the resulting irritation with grease or oil. In the 1st... Read more
	Hercules Hercules , in astronomy, northern constellation located between Lyra and Corona Borealis. It is traditionally depicted as the hero Hercules in a kneeling position. There are no very bright stars in Hercules and only three of third magnitude, the brightest of which, Ras Algethi (Alpha Herculis), is... Read more
	Corona Borealis Corona Borealis [Lat.,=the northern crown], northern constellation lying between Hercules and Boötes. Its name derives from the crown Bacchus gave Ariadne when she was deserted by Theseus. The constellation is a small arc of bright stars, of which the brightest is Alphecca (Alpha Coronae... Read more