cloud of electrons -
71Motion (physics) — Motion involves change in position, such as in this perspective of rapidly leaving Yongsan Station In physics, motion is a change in position of an object with respect to time. Change in action is the result of an unbalanced force. Motion is… …
72atmosphere — atmosphereless, adj. /at meuhs fear /, n., v., atmosphered, atmosphering. n. 1. the gaseous envelope surrounding the earth; the air. 2. this medium at a given place. 3. Astron. the gaseous envelope surrounding a heavenly body. 4. Chem. any… …
73Nobel Prizes — ▪ 2009 Introduction Prize for Peace The 2008 Nobel Prize for Peace was awarded to Martti Ahtisaari, former president (1994–2000) of Finland, for his work over more than 30 years in settling international disputes, many involving ethnic,… …
74Compact star — In astronomy, the term compact star (sometimes compact object) is used to refer collectively to white dwarfs, neutron stars, other exotic dense stars, and black holes. These objects are all small for their mass. The term compact star is often… …
75electron — /i lek tron/, n. 1. Also called negatron. Physics, Chem. an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10 19 coulombs, a mass of 9.108 × 10 31 kilograms, and spin of 1/2, and existing… …
76X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …
77Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …
78Henrik Svensmark — Infobox Scientist box width = name = Henrik Svensmark image size = 180px caption = Henrik Svensmark birth date = birth place = death date = death place = residence = citizenship = nationality = Danish ethnicity = fields = Physicist workplaces =… …
79materials testing — Introduction measurement of the characteristics and behaviour of such substances as metals, ceramics, or plastics under various conditions. The data thus obtained can be used in specifying the suitability of materials for various… …
80Corona — This article is about the astronomical term. For other uses, see Corona (disambiguation). During a total solar eclipse, the solar corona can be seen with the naked eye. A corona is a type of plasma atmosphere of the Sun or other celestial body,… …
