Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

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• Digital Stellar Spectra
• Fabry-Perot Images of Spiral Galaxies

... The first time you acquire an object you must include the overhead for the guide star acquisition. ... If it is larger, then the observer can choose to maintain pointing through the gyros (drop-to-gyro) or re-acquire the guide stars (3 minute overhead per re-acquisition-note that this is not the 6-minute orbit re-acquisition) every time the telescope goes back to the target; with the first option the pointing uncertainty is about 1 milliarcsec/second due to telescope drift. ... Exposure overheads: ....

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• Results
• Making HST Pictures: Illustrations
• Alternate Method for Predicting Target Acquisition Count Rates

... 2013 April 8 . A Redshift Lookup Table for our Universe . ... One such table is listed above , where redshift z is listed in the first and last columns, while the corresponding universe age in billions of years is listed in the central column. ... Although stars in our galaxy are effectively at cosmological redshift zero, the most distant supernova e seen occur out past redshift one , which the above chart shows occurred when the universe was approximately half its present age. ... About APOD | ...

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• Intro
• Zen: tp search en
• APOD: July 13, 1996 - M81: A Bulging Spiral Galaxy

... Colours of stars and galaxies hold information on intrinsic and extrinsic parameters, such as stellar temperatures and galaxy populations, selective absorption and colour changes due different dust contents and inclination angles of galaxies, as well as galaxy redshifts and evolution. ... The colour magnitude diagram of 65000 galaxies to which all above-mentioned quantities and others contribute can only be explained by comparison with simulations. ... Colours are also of technical help. ...

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• Different X-ray Spectra

... The first part of the Astropark that most people see represents our own Solar System. The Sun and the nine main planets are laid out here, so that you can compare their distances and sizes. ... The Sun - the closest star to Earth, represented by a giant archway at the same scale as the planets beyond. ... They move in orbits around the Sun, also marked out in the Astropark. Moons - in orbit around nearly seven of the planets, but not represented in the Astropark. ...

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• Armagh Astropark: The Solar System
• Why Asteroid 2008 TC3 Represents a Landmark - Dr David Asher, from Armagh
• Two kinds of devices

... Circle area is proportional to the number of tweets + retweets tweets retweets . Order accounts: by user number (effectively random) by number of tweets (includes retweets) by number of followers by number of followers that also tweeted about AAS223 by number of friends that also tweeted about AAS223 . ... The top/left position is for the user with the largest number of followers, and the bottom/right is for the smallest number of followers. by number of followers that also tweeted about AAS223 . ...

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• A matrix of tweets from #AAS221
• How did I collect the tweets from the 219th meeting of the AAS
• The AstroStat Slog Blog Archive different views

A visual impression of the data used in the study. The relevant extra-galactic maps are represented as shells of increasing distance from Earth from left to right. ... After this are six shells containing maps of the millions of distant galaxies used in the study. These maps are produced using different telescopes in different wavelengths and are color-coded to show denser clumps of galaxies as red and less dense regions as blue. There are holes in the maps due to data quality cuts. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B68BEC815-22B6-4200-BE17-7823AB0C3101%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B1625AABD-E6AA-4752-B8C6-27CD0F966524%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7BE697A649-B990-4F0C-9693-88E72FFCBA78%7D

Guest Editorial , July 2006 . Past ? Present ? Future . ... SETI, the quest for reasonable signals from Space, is aimed at the Past. ... From here on Earth, we can say with good reason that conducting both searches (SETI) and transmission (METI) of reasonable signals, we appear poised just halfway between the Past and the Future: namely, in the Present! ... This editorial was submitted in response to Their Past, Our Future , by SETI League executive director emeritus H. Paul Shuch. ...

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• ONE-DIMENSIONAL RADIO MESSAGE FOR "BLIND" ALIENS
• Online EIT reconstruction server

... Next | Index . A window can display multiple, independently scrollable frames on a single screen, each with its own distinct URL. ... The Frame object is provided a convenience for referring to the objects that constitute frames. However, JavaScript actually represents a frame using a window object. Every Frame object is a window object, and has all the methods and properties of a window object. ... JavaScript 1.1: added blur and focus methods; added onBlur and onFocus event handlers . ...

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• APOD: 2000 July 13 - LP 944-20: A Failed Star Flares
• APOD: 2000 September 21 - XZ Tauri System Ejects Gas Bubble
• Arcetri Guaranteed Time

The Mars Flag has a different design on the reverse side. obverse side of flag . ... The orbit lines on the obverse cross the Sun on the lower half of the flag and appear to go behind the Sun on the upper half of the flag. The reverse side has the orbits lines continuing around the Sun on the upper half of the flag. ... The Mars Flag reverse side is a continuation of the obverse side and not just a different design on the back and not a mirror image of the obverse. Main Flag Background Color . ...

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• ASP: The New and Improved Hubble Space Telescope
• ASP: Star Science in the Autumn Sky
• ASP: Astronomical Society of the Pacific Presents Pricilla and Bart Bok Awards

... Formulas are very similar to equations. Consider for now only equations with one unknown variable , denoted by some letter, which can be x but can also be different. An equation is an equality between two mathematical expressions containing the unknown number (maybe in several places), as well as other numbers which are known. ... For instance--if you multiply two sides of a formula by the same number, the result is still a valid formula, even if what you multiply contains unknown numbers. ...

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• Electromagnetic Waves
• Trigonometry beyond 90 degrees
• The Lagrangian Point L1

... In combining the data, it is assumed that the low resolution image better represents the short spacing data, whereas the high resolution best represents the fine structure. ... Key: out The output image. ... Key: factor The flux calibration factor. ... In practise, the calibration may not be perfect, and an extra calibration factor will be required to align the flux scales. "factor" gives the factor to scale the low resolution image to put it on the same flux scale as the high resolution image. ...

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• Polarization/Stokes Handling (stokes and select)
• casacore: scimath package (libcasa_scimath)
• casacore: casa::ComponentType Class Reference

... Especially necessary for an assessment of the calibration reliability of simulations of the different observing modes (still to be performed by the XMM-Newton calibration teams) was the closure of the loop between simulation and data analysis. This has been done complementing the SciSim release with the release of 90 specific SciSim calibration files included in the SciSim CCF tarfile , together with the corresponding Calibration Index file CCF_scisim.cif. ... Pages maintained by SAS librarian . ...

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• Description
• Basic Idea
• Different types of detector map

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bad TV
• Phil Plait's Bad Astronomy: Bitesize Astronomy

... We describe a new library (AST) which provides a flexible high-level programming interface for handling world coordinate systems in astronomy and for producing graphical output. ... Relationships between coordinate systems are represented within AST by objects called Mappings. ... While Mappings represent the relationships between coordinate systems, the coordinate systems themselves are represented by objects called Frames. ... Like all objects, a Frame also provides methods. ...

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• The PROS Big Picture: A High-Level Representation of a Software System
• Recognition of Anomalous Events
• A Commodity Computing Cluster

... There are several classifications of the exact methods. ... A more physical classification is that of Th.Wriedt (1998) where he devides the methods in 3 groups: Mie theory expansions (SVM), surface-based (PMM, EBCM, GMT, MoM) and volume-based (FDTDM, TLMM, FEM and various volume IEMs - CDM, DDA, etc.) methods. Features of the methods . Among the methods only SVM and EBCM are capable to provide very accurate results (5 and more correct decimals) (Mishchenko et al., 2000). ... 1998) Part. ...

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• The Atomic data Guide
• Database of Optical Constants -- Misc: computer codes
• Linear polarization: wavelength dependence

The Big Bang was not an explosion from a single point, with a center and an edge. ... Each dot represents a "galaxy". Two of the galaxies have a ring of red photons moving out from them. Most of the photons are cosmic microwave background photons that were present since the Big Bang but which have been traveling freely only since 0.0003 Gyr after the Big Bang. ... However, all parts of the Universe started with CMBR photons, not just the two green galaxies. ... FAQ | ...

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• WorldOrImageCoords(3)
• Sky models
• Results and discussion

... Space flight . ... Simulators . ... Space camp . Space Hotel . ... Virtual reality-based stand for ISS crew training is used for cosmonauts pre-training preparation at different stages of training for the space flight. ... At present cosmonauts and astronauts can work both with the SM and FGB images independently and having them in mated state. ... Info: Industry news On-line Data Company ATLAS news Events We in press Contact . Copyright 2000-2016 ATLAS Aerospace . ...

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... Unlike the previous digital-only Messages, Arecibo-1974 and Evpatoria-1999, the TAM has complex, three-section structure with different forms of information. Section 1 represents coherent sounding radio signal with slow Doppler wavelength tuning to imitate transmission from Sun's center. ... Section 2 is an analog information and represents musical melodies, performed on the Theremin. ... There were seven musical compositions in the 1st Theremin Concert for Aliens. ...

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• http://lnfm1.sai.msu.ru/SETI/eng/articles/zait_eng.html
• http://lnfm1.sai.msu.ru/SETI/koi/articles/zait_eng.html
• http://lnfm1.sai.msu.ru/~tempus/english/science/articles/ZotovPoster_APSG2013.pdf

MODERN APPROACHES TO CALCULATION OF THE PROPERTIES OF MATERIALS FOR ENERGY STORAGE A. Kabanov Samara State University The modern technologies demands to compact and effective rechargeable systems of energy storage. ... In this work we investigated the activation energies of one promising compound ­ Li2CoPO4F using combination of two methods ­ ab-initio and geometrical calculations. ... The nudged elastic band (NEB) method is adopted to find the kinetic energy barrier along diffusion pathways. ...

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• SSAU presented its educational programs at the exhibition AULA-2015