Cometary brightness

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• Comet Hale–Bopp — C/1995 O1 (Hale–Bopp) Discovery Discovered by: Alan Hale and Thomas Bopp Discovery date: July 23, 1995 Alternate designations: The Great Comet of …   Wikipedia

• asteroid — asteroidal, adj. /as teuh royd /, n. 1. Also called minor planet. Astron. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those… …   Universalium

• astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …   Universalium

• Comet — This article is about the astronomical object. For other uses, see Comet (disambiguation). Comet Hale– …   Wikipedia

• Comet Hale-Bopp — Infobox Comet name=C/1995 O1 (Hale Bopp) discoverer=Alan Hale and Thomas Bopp discovery date=23 July 1995 designations=The Great Comet of 1997, C/1995 O1 epoch=2450460.5 semimajor=186 AU perihelion=0.91 AU aphelion=371 AU gravitational parameter… …   Wikipedia

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• Great Comet — A Great Comet is a comet which becomes particularly bright and is very spectacular to a casual observer on Earth. Great comets appear, on average, once every decade. Predicting whether a comet will become a great comet is notoriously difficult,… …   Wikipedia

• Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   Universalium

• List of notable asteroids — Vesta is the brightest and second most massive asteroid. It suffered a crust penetrating impact approximately one billion years ago.[1] The following is a collection of lists of notable asteroids in the Solar System. For the purpo …   Wikipedia

• Oort cloud — An artist s rendering of the Oort cloud and the Kuiper belt (inset). Sizes of individual objects have been exaggerated for visibility …   Wikipedia