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 . ...

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 . ...

... 32a. Solar Early Warning . 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. ... One possible loophole remains. ... And yet... the "Orion" propulsion method could one day be the only practical way of protecting Earth from asteroid impact. ... Next Stop: #32 Far-out Pathways to Space: Solar Sails . ...

Subject, Object and Problems of Astrophysics. Practical and Theoretical Astrophysics. ... Visual Telescope; Problems Which Are Solved with the Its Help. ... Resolution of Telescopes. ... Effectiveness of Telescope in Respect of Resolution. ... Optical Power of Telescopes for Star-like and Extensive Objects. Boundary Magnitude. Reasons of Light Dissipation in Telescopes. ... Spectral Instruments in Astrophysics. ... Basic Photometrical Ideas, Magnitudes and Their Measurement. ...

... Why does the Sun shine? The Sun is a mass of incandescent gas, . ... Where hydrogen is built into helium . ... The Sun is hot . ... And even when it's out of sight the Sun shines night and day . ... That heat and light from the Sun come from nuclear reactions of hydrogen, carbon, nitrogen and helium . ... Why does the Sun shine " from Space Songs LP (series: Singing Science Records) , produced in the late 1950s by Hy Zaret and Lou Singer; singers: Tom Glazer and Dottie Evans. б© 2010 OASES . ...

... The Sun is powered by nuclear fusion: hydrogen `burns' to form helium, releasing energy . ... At an age of ~10 billion years (slightly over twice its present age), the Sun will exhaust the fuel available in its core. ... Pressure overwhelms gravity, and over a period of a few hundred thousand years, the Sun evolves into a `red giant' . ... Red giants have lifetimes of less than 100 million years. The temperature in the red giant core increases to 100 million degrees . ... The Ring Nebula . ...

... Practical 1 / 8 Ebony Violin Peg Instrument Accessory . Size: SIZE 1 / 8 . ... Type: Violin Peg . For: Violin . Material: Ebony . ... Product size (L x W x H): 6 x 1.8 x 0.7 cm / 2.36 x 0.71 x 0.28 inches . Package size (L x W x H) : 7 x 3 x 2 cm / 2.75 x 1.18 x 0.79 inches . Musical Instruments . ... Package Contents: 1 x Violin Peg . ... Повседневные (casual) платья . ...

... 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. ...

... 65 Million Years Ago . ... Their sudden disappearence 65 million years ago, along with about 70 percent of all species then living on Earth, is known as the K-T event (Cretaceous-Tertiary Mass Extinction event). Geologists and paleontologists often entertain the idea of a large asteroid or comet impacting the Earth as the culprit. ... Regardless of the true cause of the K-T event, it is fortunate that such impacts are presently believed to happen only about once every 100 million years! ...

... European Southern Observatory micro Workshop on: . ESO, Garching bei M nchen, Germany . ... Contrary to normal ESO practice there is no block-booking at Garching Hotels for this workshop. ... More Information on hotels in Garching on ESO's web-site or alternatively you can find here or try your favourite search engine. ... The international airport of Munich (M nchen) is located some 20 km north of Garching. ... More travel instructions can be found on the ESO Travel and Local Information pages. ...

... October 12, 1997 . Impact! 65 Million Years Ago . ... Their sudden disappearance 65 million years ago, along with about 70 percent of all species then living on Earth, is known as the K-T event (Cretaceous-Tertiary Mass Extinction event). ... Regardless of the true cause of the K-T event, it is fortunate that such impacts are presently believed to happen only about once every 100 million years! ... About APOD > . ...

Text of these problems is available also in other languages : . ... What can one see in the Moon's sky more often - the Sun or the Earth? ... There are about of 250 millions of stars in the elliptical galaxy M32 (a satellite of Andromeda galaxy). ... The masses of Capella's components. ... You are proposed to estimate the masses of Capella's components, using our observational data. ... A galaxy's mass. ... Estimate the mass of FGC 1908 and compare it to the mass of our galaxy. ...

Next: Loading data into Miriad: Up: Reducing 3-mm ATCA observations Previous: Flux density calibrators . When observing at two bands with the ATCA, it is generally sensible to set the two bands so that they do not overlap. ... However having the bands overlap complicates the data reduction process in Miriad . ... Loading data into Miriad : ATLOD . Initial ``fixes'' to millimetre data . ... Bandpass and antenna gain calibration . Flux density bootstrapping . ... Miriad manager . ...

... In the very first iteration, the user is required to input the true coordinates of at least two sources interactively. For this Ds9 is launched showing an image that has been accumulated from the input event list with all found sources marked through excluded circles . For each source that is to be used as a reference source the user needs to: . ... There is an alternative reference source input method available that is activated with the withrefsrclist parameter. ...

The AstroGuide . ... AstroGuide | ... Other Sites . ... AstroGuide Listing . Login . See many more Astronomy Listings by: Category or Alphabet . ... Listed Since December 26, 1998 . ... Web Site . ... However, you must Login to submit a comment. ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

Общая Астрономическая Конференция > Товары для астрономов > Полезное для астрономии . The Urban Astronomer's Guide (Patrick Moore's Practical Astronomy Series) . ... Астрономический Online журнал . ... Лунные феномены (редкие, необычные явления) Жизнь астрономов-любителей Анонсы астрономических мероприятий Астрономические клубы Наш "Старлаб" . ... Astronomy with a home Computer (Patrick Moore's Practical Astronomy Series) . ...

In the PROJECT we are using the following peculiar . features of RATAN-600 . ... Brightness temperature sensitivity being equal to the antenna temperature sensitivity .. ... Receiver system .. ... Using aperture averaging effect. dual- beam and dual (multi-) frequency filtration, we demonstrated full filtration of the atmosphere noise down to the receiver noise at all scales of acoustics peaks ( Fig.1 , Fig 2 ). ... We select this frequency as the central one in our project. ... Antenna surface . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Image credit:ESO/J.Emerson/VISTA. ... However others are less pessimistic and it has even been claimed that the mysterious ?Wow! signal? received in 1977 originated from the direction M55.б  Sadly, this still unexplained pulse of radio energy originated from a location rather to the northwest of M55 so I doubt if the source was this cluster (if indeed the signal was genuinely of extraterrestrial origin). ... Mysterious Wow! ...

... Research areas . ... Events The Second All-Russian Research and Practical Conference 'Actual problems in Avionics Research: Theory, Service, Developments' . ... The Second All-Russian Research and Practical Conference 'Actual problems in Avionics Research: Theory, Service, Developments' "(AVIATOR) will take place at the Faculty of Aviation Equipment of the Military Educational and Scientific Centre of Air Force 'Air Force Academy named after Professor N. E. Zhukovskiy and Yu. ...

... Schools . ... Dean?s Office . Departments . ... Applied Chemistry Department . ... Theoretical and Applied Systems Engineering Department . ... Economic Cybernetics and Applied Economics Department . ... School of History . ... Ancient and Medieval History Department . ... History ofљEastern Europe Department . Modern and Contemporary History Department . Ukrainian History Department . ... University History Museum . ... History of Russian Literature Department . ... School of Physics . ...