I'm glad you're interested in collaborating on the ConcepTests for Astronomy WWW database project! ... I'm looking forward to your contributions! ... a) high luminosity, high temperature to low luminosity, low temperature . b) high luminosity, low temperature to low luminosity, low temperature . c) high luminosity, low temperature to low luminosity, high temperature . d) high luminosity, high temperature to low luminosity high temperature. ... Back to Paul Green's Peer Instruction page. ...

... We considered our current level of technology compared to that of an average alien civilization. Regardless of any modest value of L chosen?500 years, 5000 years, or longer?their level of technology is vastly advanced compared to ours. Thus, most science fiction gets it right by having advanced alien technology, but gets it wrong by not making them sufficiently advanced. ... What would alien civilizations at a distance of 100 or 1000 lightyears know of us (hypothetically)? ... Education . ...

... An Unexpected Flare from the Crab Nebula . ... Credit Copyright: NASA , DOE , Fermi LAT , R. Buehler ( SLAC , KIPAC ) Explanation: Why does the Crab Nebula flare? ... As recently as one month ago, gamma-ray observations of the Crab Nebula by the Fermi Gamma Ray Space Telescope showed an unexpected increase in gamma-ray brightness, becoming about five times the nebula's usual gamma-ray brightness, and fading again in only a few days. ... Publications with keywords: Crab Nebula - gamma ray . ...

Space Telescope Science Institute . ACS Instrument Handbook Cycle 19 . ... Advanced Camera for Surveys Instrument Handbook for Cycle 19 > Chapter 9: Exposure-Time Calculations > 9.1 Overview . ... In this chapter we explain how to use sensitivities and throughputs to determine the expected count rate from your source and how to calculate exposure times to achieve a given signal-to-noise ratio for your ACS observations taking all background contributions into account. ...

... QSO spectra in the ROSAT band are steeper than the background at harder energies, and furthermore at fluxes below 1E-14 ergs/(s cmќ) the quasar source counts flatten off and are replaced by more numerous populations of relatively low red-shift objects, apparently Narrow Emission Line Galaxies (NELG). ... We extracted the luminosity function from ROSAT Deep Survey results, and extrapolated by a factor of 2 - 3 to account for changes expected in the harder XMM band. ...

... 2011 May 23 . An Unexpected Flare from the Crab Nebula . ... As recently as one month ago, gamma-ray observations of the Crab Nebula by the Fermi Gamma Ray Space Telescope showed an unexpected increase in gamma-ray brightness, becoming about five times the nebula's usual gamma-ray brightness, and fading again in only a few days. ... The above image shows how the Crab Nebula normally appears in gamma rays, as compared to the Geminga pulsar, and how it then appeared during the recent brightening. ...

For today's in class we will be working with spatial and temporal data sets which are quite noisy. Particularly, you have monthly rainfall totals for the following six locations in Oregon from the period 1950 - 1999. Eugene . Salem . Portland . Astoria . North Bend . Newport . There are many facets of what you can do with this data. Please explore the following questions with some degree of sound statistical reasoning and data presentation: .

... For a pulsar search observation, with the two polarizations averaged, a useful rule of thumb can be given for calculating the expected rms noise. If the rms noise, , is expressed in terms of the flux density of the target pulsar, then; . ... Robert Minchin 2012-02-22 ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The present-day DD population is examined as a function of Galactic star-formation history alone. It is shown that the frequency distribution, in particular, is a sensitive function of the Galactic star formation history and could be used to measure the time since the last major star-formation epoch. ... Last Revised: 2012 November 22nd . ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Company's History . ... History . Brief History of Rocket and Space Technology . ... Project History . ISS Russian Segment . Steps of ISS Assembly . ... ISS 45/46 . ... Rocket Space Complexes . ... Automatic Space Systems . Universal Space Platform . ... History of flights . ... UDOD . ... Man in space | ... Kit "UDOD-КRM", including data storage device "UDOD. ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

... Figure 1: A sketch of the southern side (main entrance area) of the new Control Building. ... This will happen in late 2006 or early 2007. ... As with Narrabri, a broadband fibre connection to Mopra and Siding Spring Observatory was installed in early December, with commissioning again expected in late February or early March. ... The surges that accompanied the failure overwhelmed the Control Building uninterruptible power supply, causing a power loss to the Control Building equipment. ...

The Proceedings will be published by World Scientific . ... http://www.arcetri.astro.it/~texaflor/proceedings/Texas2002proc_LaTeX2e.tgz . ... http://www.arcetri.astro.it/~texaflor/proceedings/ASSIGN-STD.ps . http://www.arcetri.astro.it/~texaflor/proceedings/ASSIGN-STD.pdf . http://www.arcetri.astro.it/~texaflor/proceedings/ASSIGN-STD.doc . ... b) no color page or color image or color graph will be accepted under any circumstance. ... http://www.arcetri.astro.it/~texaflor/ . ...

... We employ Bayesian inference for the joint estimation of sources and background on ROSAT All-Sky Survey (RASS) data. ... Background maps were estimated in a single step together with the detection of sources without pixel censoring. ... The source probability is evaluated for single pixels as well as for pixel domains to enhance source detection of weak and extended sources. ... The spline fits the background component whereas count enhancements classify pixel (domains) with source contributions. ...

... The hotter the gas, the faster they move, and the more energy each of them holds. The free ions and electrons in a plasma behave the same way. Knowing the temperature of the high atmosphere of Earth, or that of the Sun, we can calculate energies expected of ions and electrons found there. However, ions and electrons actually observed in space are often much , much more energetic, and may move at a respectable fraction of the velocity of light (300,000 km/sec or 186,000 miles/sec). ...

Address: ESO Karl-Schwarzschild-Str. 2 D-85748 Garching (Germany) Telephone: +49 89 32006343 Fax: +49 89 3202362 Email: msarazin@eso.org Expected absences from office. Weather forecasting - forecasting of seeing, fuzzy logic ; . Astroclimatology , - meteorology, telescope environment, atmospheric turbulence, and related topics; . ... ESPAS Working Group Homepage . ... IAUS 288: Astrophysics from Antarctica 20-24 August 2012, Beijing, China Nanjing . ...

... We present methods of comparing theoretical predictions for the anisotropy of the Cosmic Microwave Background Radiation (CMBR), with the results of various experiments. ... Temperature flucuations . ... Most models of structure formation in the universe predict anisotropies in the CMBR. ... Therefore one must take into account not only the theoretically expected value of the temperature fluctuation but also the so-called cosmic variance, i.e. the theoretical error due to observing only one universe....

. Better satellite instruments are improving measurements of solar energy reaching Earth. Exactly determining the contribution of solar fluctuations to rising global temperature is expected to become possible as new instruments, such as the Total Irradiance Monitor above, further refine solar measurements. The device is scheduled to launch next month on NASA's Glory spacecraft. NASA

Astronomy Discussion Forums . ... I Expected More Sense Than That. ... Post Message | ... Posted by Richard D. Stafford, Ph.D. on November 8, 2002 04:14:05 UTC . ... You are missing the point - harvey1 - November 8, 2002 - 13:10 UTC . I hope Stafford doesn't mind my intruding his forum - mrsouza - November 8, 2002 - 14:55 UTC . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... I.A.Dynnikov, Three-page approach to knot theory. ... Universal semigroup, Funktsional'nyi Analiz I Prilozhenija, 34 (2000), no.1, 29-40 (Russian); English translation in Functional Analysis and Its Appl. 34 (2000), no.1, 24-32. I.A.Dynnikov, Finitely presented groups and semigroups in knot theory. ... Math. 2000, no. ... English translation: Russian Math. ... A.Vershik, Numerical invariants of exponential groups, and a locally free approximation of braid groups (in Russian), Zapiski Nauchn. ...

GTK+ 2.0 Tutorial . Prev . Next . This document, like so much other great software out there, was created for free by volunteers. If you are at all knowledgeable about any aspect of GTK that does not already have documentation, please consider contributing to this document. If you do decide to contribute, please mail your text to Tony Gale, gale@gtk.org . Also, be aware that the entirety of this document is free, and any addition by you provide must also be free. ...