intergalactic hydrogen

См. также в других словарях:

• Intergalactic space — is the physical space between galaxies. Generally free of dust and debris, intergalactic space is very close to a total vacuum. Some theories put the average density of the Universe as the equivalent of one hydrogen atom per cubic meter.… …   Wikipedia

• Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… …   Wikipedia

• Timeline of knowledge about the interstellar and intergalactic medium — Timeline of the interstellar medium and intergalactic medium* 1848 Lord Rosse studies M1 and names it the Crab Nebula * 1864 William Huggins studies the spectrum of the Orion Nebula and shows that it is a cloud of gas * 1927 Ira Bowen explains… …   Wikipedia

• Earth and Space Sciences — ▪ 1996 Introduction GEOLOGY AND GEOCHEMISTRY       In 1995 significant developments took place in the realm of geologic mapping, which provides the foundation for the presentation and comparison of data in the Earth sciences. The most important… …   Universalium

• ultravioletdropout — ultraviolet dropout n. 1. The disappearance of the image of an extremely distant galaxy when viewed through an ultraviolet filter, caused by the absorption of ultraviolet rays by intergalactic hydrogen gas. 2. A technique that identifies… …   Universalium

• Penzias , Arno Allan — (1933–) American astrophysicist Penzias, who was born in Munich, Germany, earned his BS at City College, New York, in 1954 after fleeing with his parents as a refugee from the Nazis. He gained his PhD from Columbia University in 1962. In 1961 he… …   Scientists

• Outer space — For other uses, see Outer space (disambiguation). The boundaries between the Earth s surface and outer space, at the Kármán line, 100 km (62 mi) and exosphere at 690 km (430 mi). Not to scale Outer space is the void that exists beyond any… …   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

• Galaxy — This article is about the astronomical structure. For other uses, see Galaxy (disambiguation). NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 55,000 light years in diameter and approximately 60 million light… …   Wikipedia

• Star — For other uses, see Star (disambiguation) …   Wikipedia

• Space colonization — Artist Les Bossinas 1989 concept of Mars mission Space colonization (also called space settlement, space humanization, or space habitation) is the concept of permanent human habitation outside of Earth. Although hypothetical at the present time,… …   Wikipedia