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Topic: UV astronomy

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  Ultraviolet - Open Encyclopedia   (Site not responding. Last check: 2007-10-21)
UV fluorescent dyes are used in many applications (for example, biochemistry and forensics).
UV light is used extensively in the electronics industry because photolithography is used in the manufacture of semiconductors, integrated circuit components and printed circuit boards.
UV light at this wavelength causes adjacent thymine molecules on DNA to dimerize, if enough of these defects accumulate on a microorganism's DNA its replication is inhibited, thereby rendering it harmless.
open-encyclopedia.com /Uv   (2066 words)

 Astronomy article - Astronomy etymologically stars Greek νόμος science - What-Means.com   (Site not responding. Last check: 2007-10-21)
Astronomy, which etymologically means "law of the stars," (from Greek: αστρονομία = άστρον + νόμος) is a science involving the observation and explanation of events occurring outside Earth and its atmosphere.
Astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and monitoring of transient phenomena.
Astronomy is not to be confused with astrology, a pseudoscience that attempts to predict a person's destiny by tracking the paths of astronomical objects.
www.what-means.com /encyclopedia/Astronomy   (1598 words)

 biology - Ultraviolet   (Site not responding. Last check: 2007-10-21)
UV radiation is often used in visible spectrophotometry to determine the existence of fluorescence a given sample.
UV radiation is used extensively in the electronics industry because photolithography is used in the manufacture of semiconductors, integrated circuit components and printed circuit boards.
UV detectors which are sensitive to UV light in any part of the spectrum respond to irradiation by sunlight and artificial light.
www.biologydaily.com /biology/UV   (2138 words)

 UV astronomy - Wikipedia, the free encyclopedia
UV astronomy is the branch of astronomy and astrophysics which deals with objects visible in ultraviolet (UV) radiation.
UV radiation ranges approximatively from 10nm (extreme UV) to 380nm (near UV).
Scientists classify UV astronomy as part of optical astronomy as optical components (mirrors, lenses and solid state digital detectors) are usually used.
en.wikipedia.org /wiki/UV_astronomy   (227 words)

 Ultraviolet : UV   (Site not responding. Last check: 2007-10-21)
UV itself can be subdivided into near UV (380-200 nm wavelength) and extreme or vacuum UV (200-10 nm).
When considering the effects of UV radiation on human health, the range of UV wavelengths is often subdivided into UV-A (380-315 nm), UV-B (315-280 nm), and UV-C (280-10 nm).
The sun emits ultraviolet light in both the UV-A and UV-B bands, but because of absorption in the atmosphere's ozone layer, 99% of the ultraviolet light that reaches the Earth's surface is UV-A. Health effects
www.freetemplate.ws /uv/uv.html   (831 words)

 ultraviolet astronomy on Encyclopedia.com   (Site not responding. Last check: 2007-10-21)
Ultraviolet (UV) line spectrum measurements are used to discern the chemical composition, densities, and temperatures of interstellar gas and dust, and the temperature and composition of hot young stars.
Although attempts to study the sun's UV spectrum from balloons were made during the 1920s, it was not until 1946 that rocket-borne instruments made this possible.
NASA's Orbiting Astronomical Observatory (OAO) satellites, the first of which was launched in 1966, returned UV data about stars and interstellar gas and dust and the first observations of the powerful UV radiation emitted by certain galaxies.
www.encyclopedia.com /html/u/uv1-astro.asp   (622 words)

 Ultraviolet - free-definition   (Site not responding. Last check: 2007-10-21)
The sun emits ultraviolet light in the UV-A, UV-B, and UV-C bands, but because of absorption in the atmosphere's ozone layer, 99% of the ultraviolet light that reaches the Earth's surface is UV-A. (Some of the UV-C light is responsible for the generation of the ozone.)
In general, UV-A is the least harmful, but can contribute to the aging of skin, DNA damage and possibly skin cancer.
UV light is used extensively in the electronics industry because photolothography is used in the manufacture of semiconductors, integrated circuit components and printed circuit boards.
www.netlexikon.akademie.de /Uv.html   (1830 words)

 Nat' Academies Press, Astronomy and Astrophysics in the New Millennium: Panel Reports (2001)
Astronomy and Astrophysics in the New Millennium: Panel Reports technology developed for both SIM and NGST, the panel saw it as being less technologically ready for the coming decade and therefore gave it lower priority.
Astronomy and Astrophysics in the New Millennium: Panel Reports Studying the Feedback from Star Formation An important challenge for UV astronomy in 2010 will be to follow the emergence of the modern universe over the last 10 billion years (z<1.65).
UV spectra of both emission and absorption lines provide quantitative measurements of the effects of “feedback” from star formation on the surrounding IGM and on the galaxies themselves.
www.nap.edu /books/0309070376/html/327.html   (6560 words)

 Frontiers - Editorial
The UV is an integral part of the astronomical coverage of the electromagnetic spectrum, as are gamma-rays, X-rays, optical, IR and radio.
The continued stiff competition for UV observations with the HST, and the results of several NASA-sponsored UV workshops, show that continued access to the far-UV waveband will be essential for a substantial amount of fundamental science in the foreseeable future.
The whole UV band is a rich region for carrying out spectroscopy on ALL elements at ALL stages of ionisation, thus allowing the investigation of plasmas from the coolest regimes (10-1000 K) up to the hottest (10 million K).
www.pparc.ac.uk /frontiers/text/editorial2.asp   (615 words)

 UV astronomy -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-21)
UV observations can also provide essential information about the (Click link for more info and facts about evolution of galaxies) evolution of galaxies.
The ultraviolet (Everything that exists anywhere) Universe looks quite different from the familiar ((astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior) stars and (Click link for more info and facts about galaxies) galaxies seen in ((physics) electromagnetic radiation that can produce a visual sensation) visible light.
Clouds of gas and dust would block our vision in many directions along the (The galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky) Milky Way.
www.absoluteastronomy.com /encyclopedia/U/UV/UV_astronomy1.htm   (273 words)

 SPACE.com -- After Hubble: Global Push for a World Space Observatory
UV light is absorbed in Earth's atmosphere and so must be studied from space.
Ultraviolet astronomy can't be done from the ground, so Barstow and others are keeping their focus on the loss of UV capability.
She said UV light "carries a wealth of information precious in every field of modern astrophysics, from solar system objects to stars, star forming regions, interstellar medium, supernovas, galaxies," and more.
www.space.com /scienceastronomy/world_telescope_040406.html   (1254 words)

 ASTR 511, O'CONNELL. UV Astronomy
High & variable UV extinction is an advantage for studying grain types in different environments but a disadvantage for studying things behind grains.
UV Technology Overview, in "From X-rays to X-Band", an STScI Workshop, 2000.
These notes are intended for the private, noncommercial use of students enrolled in Astronomy 511 at the University of Virginia.
www.astro.virginia.edu /class/oconnell/astr511/UV-astron-f01.html   (757 words)

 Astronomy Departments
The object of the American Astronomical Society Division on Dynamical Astronomy is the advancement of all aspects of dynamical astronomy, including celestial mechanics, solar system dynamics, stellar dynamics, the dynamics of the interstellar medium and galactic dynamics, and coordination of such research with other branches of science.
This is the homepage for the Columbia University Department of Astronomy and the Columbia Astrophysics Lab.
Astronomy and Astrophysics in the Physics Department of Ohio University at Athens, Ohio.
www.cv.nrao.edu /fits/www/yp_dept.html   (10323 words)

 oe magazine - Eye on Technology   (Site not responding. Last check: 2007-10-21)
Practical limitations of the Hubble Telescope, however, such as restrictions on UV observation time and the phasing out of the UV spectrographs, make it necessary to plan for a high-resolution replacement for UV astronomy.
UV is also a key spectral band used to measure mass outflows in quasars and star-forming galaxies.
UV light is absorbed in the Earth's atmosphere and, therefore, is best studied from space-based observatories.
oemagazine.com /fromTheMagazine/jun04/eyeontech.html   (2217 words)

 The Prediction of Stellar Ultraviolet Colours   (Site not responding. Last check: 2007-10-21)
The database is useful for the prediction of stellar UV colours.
The prediction of the UV magnitude of stars is of great importance for any efficient UV astronomy space mission.
The values of UV, V and B - V were derived synthetically from IUE spectra and compared to photometric data from the TD-1 satellite.
cadcwww.dao.nrc.ca /ADASS/adass_proc/adass3/papers/shemi/shemi.html   (624 words)

Karl Henize, a NASA astronaut and astronomer at the University of Texas, was the principal scientist for one of Skylab's UV stellar astronomy experiments and had an instrument required for Hamilton's experiment.
In 1967, Jocelyn Bell, an astronomy student at Cambridge University was investigating fluctuations in the strength of radio waves emitted by distant galaxies.
X-ray astronomy is one of the younger branches of an ancient science, only recently made possible with the advent of space technology.
history.nasa.gov /SP-401/ch8.htm   (3114 words)

 Andre HECK - Papers on classification
UV stellar classification - Proceedings of a workshop held at VILSPA 26-28 October 1981 (Editor, with B. Battrick), ESA SP-182 (1982) vi + 136 pp.
Proceedings of the VILSPA workshop on UV stellar classification, ESA IUE Newsl.
UV stellar spectral classification, in Exploring the Universe with the IUE Satellite, Eds.
cdsweb.u-strasbg.fr /~heck/p-class.htm   (992 words)

 Curious About Astronomy: How can I contribute to science as an amateur astronomer?
To do any UV astronomy is pretty impractical, but there are things you can do with other equipment, for different price ranges.
If you have a question about another area of astronomy, find the topic you're interested in from the archive on our site menu, or go here for help.
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
curious.astro.cornell.edu /question.php?number=188   (612 words)

 Ultraviolet at opensource encyclopedia   (Site not responding. Last check: 2007-10-21)
UV light is used extensively in the electronics industry in a procedure known as photolithography, where a chemical known as a photoresist is exposed to UV light which has passed through a mask.
It is photolithography which is primarily used to create integrated circuit components and printed circuit boards.
Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but...
www.springknow.com /UV.html   (1760 words)

 Nat' Academies Press, Working Papers: Astronomy and Astrophysics Panel Reports (1991)
Solar blind photon counters were invented for uv astronomy and later adapted to sensing the uv corona round supersonic objects in daylight and for toxic gas detection.
Looking ahead, the Navy is supporting neutrino astronomy for its long-term potential for communicating through the earth and for long distances under water.
Another area where astronomical and defense interests overlap is in the need for precise coordinate systems, times, and time intervals, for use in navigation, clock synchronization, guidance, and secure communications as well as in astrophysics.
www.nap.edu /books/0309043832/html/309.html   (889 words)

 P&A History4.html
Thus it appeared that the C abundance was the controlling factor in determing the spectral characteristics of the WN and WC sequences, and it was concluded that WR stars were in the helium-burning phase, the WN stars being less evolved than the WC.
Wilson and D. Carnochan with Nandy and Thompson studied the galactic distribution of the agents causing the extinction bump near 2200 Å and the UV colour excess E(1550-2740) within 2 kpc of the Sun in the galactic plane.
Because of their similarity to WR stars, in sharing the characteristics of extended atmospheres and mass loss, the UV data for 23 Of stars were analysed, but no extinction anomalies were found.
www.phys.ucl.ac.uk /department/history/BFox4.html   (17881 words)

 [No title]   (Site not responding. Last check: 2007-10-21)
Symposium 'Advances in UV Astronomy:  4      Years of IUE Research', NASA CP 2238, 177, 1982.
Symposium 'Advances in UV Astronomy:  4      Years of IUE Research', NASA CP 2238, 185, 1982.
"A      Decade of UV Astronomy with the IUE Satellite", ESA SP-281,      2, 293, 1988.
www.sfwa.org /members/kotani/kondopapers.txt   (9938 words)

 IAAT (Astronomy): WSO/UV-HIRDES Group Home Page
Under the Long Range Planning of the European Space Agency an Assessment Study was made for the UN Outer Space Division, evaluating a WSO Mission for the ultraviolet domain (WSO/UV).
The WSO/UV is an Astrophysical Observatory rather than a targeted mission for a single science goal, and it could be launched optimally in 2006/7.
The WSO/UV is very timely, since there exists a critical "window of opportunity" associated with the UV Survey (GALEX), to explore the rich new data from this Survey.
astro.uni-tuebingen.de /groups/wso_uv   (441 words)

 UV astronomy - Encyclopedia, History, Geography and Biography
UV astronomy - Encyclopedia, History, Geography and Biography
This page was last modified 17:50, 15 Apr 2005.
This encyclopedia, history, geography and biography article about UV astronomy contains research on
www.arikah.net /encyclopedia/UV_astronomy   (225 words)

 The Skylab Space Station
Circling 50 degrees north and south of the equator at an altitude of 435 km, Skylab had an orbital period of 93 minutes.
There were a plethora of UV astronomy experiments done during the Skylab lifetime, as well as detailed X-ray studies of the Sun.
UV and X-ray solar photography for highly ionized atoms
heasarc.gsfc.nasa.gov /docs/heasarc/missions/skylab.html   (456 words)

 Network for UltraViolet Astrophysics
The objectives of the NUVA are to formulate and operate a UV astronomy network and to plan and execute a road mapping exercise.
During the next 18 months NUVA activity will be concentrated on a critical assessment of the publicly available information in various archives and an exploratory analysis to define the scientific requirements for the future.
We would like to invite all of you who are interested in the future of ultraviolet astronomy to establish contact with us.
www.ucm.es /info/nuva/mipag.php?id_llamador=0   (207 words)

 AST 443: The Future of Observational Astronomy   (Site not responding. Last check: 2007-10-21)
A desired followup to HST for diffraction limited optical and UV imaging, and high resolution UV spectroscopy.
Astronomy, Space, and the Moon by W.G. Tifft
Excerpts from "Astronomy from the Moon: A Second Look", by P.D. Lowman.
www.ess.sunysb.edu /fwalter/AST443/future.html   (447 words)

Commonly used photocathodes for the 50Å to 2000Å UV range are alkali halides such as CsI [1], and KBr [2].
Diamond is a material which holds some promise as a photocathode for the UV regime.
The spatial imaging (Fig.11) of UV light on the Si MCP is reasonable, and the gain uniformity is quite flat (Fig.12).
www.stsci.edu /stsci/meetings/space_detectors/ossyrev.htm   (3484 words)

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