... The Sun . ... The Sun is a mass of incandescent gas, . A gigantic nuclear furnace . Where hydrogen is built into helium . At a temperature of millions of degrees. Yo-ho, it's hot, the Sun is not a place where we could live . But here on Earth there be no life without the light it gives . ... We need its light, we need its heat, we need its energy . Without the Sun, without a doubt, there'd be no you and me . б© 2010 OASES . ...

All stars derive their energy through the thermonuclear fusion of light elements in to heavy elements. High temperatures are required so that the mutual electrostatic repulsion of the protons in each fusing atomic nucleus is overcome. ... Elements with more protons in their nuclei require higher temperatures. ... This sequence is now shown in the animation below. ... First Step of the Proton-Proton Chain Narration . Second Step of the Proton-Proton Chain Narration . ...

... Not only can the Sun turn night to day, it can transform obscure 1950s jingles into 1990s alternative-rock hits. ... The sun is a mass of incandescent gas, . ... Studying the Sun can tie together subjects across the curriculum. ... Sunspots and prominences--the tongues of hot plasma which shoot off the Sun's surface and arch gracefully back, following the invisible tethers of magnetic field lines--are just two examples of solar volatility. ... The black dots will be easy to see. ...

... The TRACE images may be used without restrictions in publications of any kind. ... These two images, taken on 18 November 2000 at 15:54UT and 16:11UT, respectively, show such an event: the red circle in the image to the left shows a region where many loops are cooling, with bright loop tops (the intensity scales with the square root of the image to reduce the dynamic range). ... See also a collection of images related to the Sun, other cool stars, and solar-terrestrial effects . ... Images | ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2008 April 24 . Cygnus Without Stars . ... Explanation: The sky is full of hydrogen, though it can take a sensitive camera and telescope to see it. For example, this twelve-degree-wide view of the northern part of the constellation Cygnus reveals cosmic clouds of hydrogen gas along the plane of our Milky Way galaxy. ... About APOD | ...

Astronomy Picture of the Day . ... Recognizable bright nebulae include NGC 7000 ( North America Nebula ), and IC 5070 ( Pelican Nebula ) at the upper left with IC 1318 ( Butterfly Nebula ) and NGC 6888 ( Crescent Nebula ) at lower right -- but others can be found throughout the wide field. ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: Cygnus - emission nebula . Publications with words: Cygnus - emission nebula . ... IC 1396: Emission Nebula in Cepheus . ...

... Purpose: The purpose of this test is to determine the degree to which the COSTAR mirrors have reduced the throughput of the GHRS, particularly at wavelengths below Lyman-alpha. ... However, the usual series of wavelengths on both Side 1 and Side 2 will be observed so that this program is also a sensitivity monitor close-out. ... This test will execute once only during Cycle 6, at the end of the Cycle. ... Also, we will need to carefully consider how these new data compare to older sensitivity tests....

... The distomats measure the average height of the platform every 2 minutes. If the average platform height is more than .04 inches from the nominal position, the tiedowns will pull (or release) equally on all 3 corners to bring the average height back to the nominal position. ... The platform corner height versus dome position (at fixed average platform height) shows that the platform corners move by +/- 6 inches just from the dome motion (this was before the alfa upgrade). ...

Blackholes2 Forum Message . ... Holostars: Black Holes Without Event Horizons . ... Its name derives from the fact tht information is preserved in such a black hole, and must be a contraction of hologram and star. ... The exterior metrics and fields of the charged holostar are equal to the Reissner-Nordstroem black hole solution. ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Heavy elements such as the uranium used in generating nuclear power are extremely concentrated sources of energy. ... Space rockets require not just energy, but also mass , matter ejected backwards, of which nuclear fuel provides very little. The limiting factor in the operation of rockets is not a shortage of energy but the high temperature at which they operate. ... One possible loophole remains. ... Test model of "Orion," pro- . ... Next Stop: #32 Far-out Pathways to Space: Solar Sails . ...

... Dark current e - /s/pix . ... OH continuum photon/s/m 2 /arcsec 2 / m . ... Imager: . ... Adaptive Optics: . ... Object signal e - /pix . Sky thermal signal e - /pix . Sky OH continuum signal e - /pix . Sky OH line signal e - /pix . Telescope thermal signal e - /pix . AOS thermal signal e - /pix . Cryostat signal e - /pix . Dark signal e - /pix . Total signal e - /pix . ... This tool models the performance of the Gemini South Adaptive Optics Imager (GSAOI) . ...

... Precisely one month ago, on 11 July 2009, the last active area of the new solar cycle disappeared from the surface of the Sun. Over the 30 days following this, neither observers on Earth nor devices in space have been able to detect the emergence of any sunspots. ... Therefore, it seems that our star has once again returned to a state of deep solar "winter", following several sparks of activity in May-June 2009. ... To date, this period has lasted 30 days. ...

... Our Galaxy . ... Stars . ... Image credit: ESO, Acknowledgement: VST/Omegacam Local Group Survey) . First observed in 1909, the WLM galaxy is part of the Local Group, about 10 million light years (3.1 Mpc) across, this is the set of more than 35 galaxies which includes our own Milky Way. ... I compared this little galaxy to a living fossil because looking at it gives us an insight into a past era in the UniverseтАЩs history. ... Distances and metallicities for 17 Local Group galaxies? . ...

... Бизяев Иван Алексеевич (Ижевск) ( проект , публикации ) . ... Gladkaya Anna Vladimirovna (Saint Petersburg) . ... Kalmykov Lev Vyacheslavovich (Moscow) . Калмыков Лев Вячеславович (Москва) ( проект , публикации ) . ... Нилов Федор Константинович (Москва) ( проект , публикации ) . ... Томберг Артур Юрьевич (Москва) ( проект , публикации ) . ... Юрченков Александр Викторович (Москва) ( проект , публикации ) . ... Бибиков Павел Витальевич (Москва) ( проект , публикации ) . ...

. The exec statement causes the command specified as its argument to be executed in place of the current shell without creating a new process. For example: exec zmail -visual . This runs just the zmail program without a shell. When you quit the application the current shell also exits.

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

. Mapping temperatures in Abell 754 shows a lot of extremely hot gas that has been heated by shock waves as the two galaxy clusters collide. White indicates temperatures of hundreds of millions of degrees while blue regions are cooler. (Even so, the blue temperatures reach 130 million degrees.) . ESA/ XMM-Newton/ Patrick Henry et al.

... Steven L. Smith . NASA International Space Station Program Liaison to the European Space Agency . ... SPECIAL HONORS: NASA Distinguished Service Medals (two), NASA Outstanding Leadership Medal, NASA Space Flight Medal, NASA Exceptional Service Medal, IBM Outstanding Technical Achievement Award and IBM Outstanding Community Service Award. ... NASA EXPERIENCE: Smith is a veteran of four space flights covering 16 million miles and seven space walks totaling 49 hours and 25 minutes. ... DECEMBER 2013 ...

... Mass . 17a. Measuring Mass . ... A medium-size (1.25 inch wide) binder clip, as is used in offices to hold papers together--the type made of flat blue steel, with two wire handles. ... The theory predicts that the oscillation period should be proportional to the square root of the oscillating mass, including the mass of the clip. Note that gravity plays no part here: the oscillation period would be the same on the Moon or in zero-g. Denoting square root by SQRT, we have . ...

... Posts tagged ?without loss of generality? ... It has nothing to do with our BLOG or SLOG. ... Tags: without loss of generality , WLOG . ... Comment . ... Entries RSS . Comments RSS . ... General comments . ... vlk on [MADS] Parallel Coordinates . upvc windows on [MADS] Parallel Coordinates . ... Alfred Inselberg on [MADS] Parallel Coordinates . ... SAMSI AstroStat Prog. ... Entries (RSS) and Comments (RSS) . ...