A Sonic Boom . ... When an airplane travels at a speed faster than sound, density waves of sound emitted by the plane cannot precede the plane, and so accumulate in a cone behind the plane. ... As a plane accelerates to just break the sound barrier , however, an unusual cloud might form. ... A leading theory is that a drop in air pressure at the plane described by the Prandtl-Glauert Singularity occurs so that moist air condenses there to form water droplets. ... NASA Official: Jay Norris. ...

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• A Sonic Boom
• Астронет > A Sonic Boom

... 2003 May 4 . A Sonic Boom . ... When an airplane travels at a speed faster than sound, density waves of sound emitted by the plane cannot precede the plane, and so accumulate in a cone behind the plane. ... As a plane accelerates to just break the sound barrier , however, an unusual cloud might form. ... A leading theory is that a drop in air pressure at the plane described by the Prandtl-Glauert Singularity occurs so that moist air condenses there to form water droplets. ... About APOD | ...

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• APOD: 2007 August 19 - A Sonic Boom
• APOD: 2001 February 21 - A Sonic Boom
• APOD: 2003 April 1 - A New Constellation Takes Hold

... 8, ``Celestial Mechanics'', 2002 Earth penumbra effects on AES motion taking into account the refraction and the extinction of the light in the atmosphere A. M. Fominov Institute of Applied Astronomy, St. Petersburg, Russia The perturbing acceleration F of the Artificial Earth Satellite (AES) due to the solar ... In step 1, the table of the shadow function values with the angle distances d between the solar disk and the earth disk edge may be calculated. ...

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... future plans, including descriptions of files described below. Developing a Strategy for Magnetospheric Research" . by David P. Stern .. ... The "Profile" Mission . ... Planning the "Profile" Multiprobe Mission . ... for Constellation Class Missions " (V. Angelopoulos and P.V. Panetta, . ... Magnetospheric Missions: 1. ... p.559-583, October-December 2001. ... The "Profile" Constellation. by David P. Stern, J. Astronaut. ... Identification of Preferred Orbits for Magnetospheric Missions." ...

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• The Acceleration of the Aurora
• "Stargazers" and National Science Standards
• The Exploration of the Earth's Magnetosphere"

... NVIDIA, the NVIDIA logo, NVIDIA nForce, GeForce, NVIDIA Quadro, Vanta, TNT2, TNT, RIVA, RIVA TNT, Quincunx Antialiasing, and TwinView are registered trademarks or trademarks of NVIDIA Corporation in the United States and/or other countries. Linux is a registered trademark of Linus Torvalds. ... OpenGL is a registered trademark of Silicon Graphics Inc. ... Installing the NVIDIA Driver . ... Configuring X for the NVIDIA Driver . Using nvidia-xconfig to configure the X server . ...

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• Orbits in the period / acceleration plane
• Star Names
• Chapter 20. Configuring Flipping and UBB

Signs Constellations Of The Zodiac . Articles | ... The band of the zodiac is some sixteen degrees wide, extending about eight degrees north and south of what's called the ecliptic -- the Sun's path through the stars. ... Since that time, the March equinox Sun has shifted about thirty degrees westward through the constellations of the zodiac. ... While signs neatly extend eight degrees north and south of the ecliptic, aligning with the borders of the zodiac, constellations do no such thing. ...

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The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... That produces an extra resistance to the flow of current. ...

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• Principles of the Magnetic Trapping of Particles
• The Motion of Magnetically Trapped Particles -- History
• Solar Energetic Particles

. Planetary Approach . "Final Stage of the Hohmann Transfer" . Previous . Main . Next .

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• Small-Scale Dynamic Events in the Solar Atmosphere
• The Big Bang

Fellow Astronomer and Institute Science Division Head, Mario Livio, has recently published a new book, "The Accelerating Universe: Infinite Expansion, the Cosmological Constant, and the Beauty of the Cosmos". Mario describes the book as "discussing beauty as an essential ingredient of fundamental theories of the universe", and states that it was written to be fully understandable to the non-professional reader. ... We extend our congratulations on this new accomplishment! ...

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• Installing & Using Arroyo on Mac OS X
• A Brief Description of the Instrument and Its Operation
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Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Earth Satellites . ... Leonid meteors seen from 13 km altitude aboard an aircraft during the 1999 Leonids Multi-Instrument Aircraft Campaign (Leonid-MAC). Comet Tempel-Tuttle provides the cometary debris for the Leonid meteor shower. ... Every 17-19 November Earth crosses Tempel-TuttleтАЩs orbit and the Leonids become visible. With clear, dark skies observers may see 10 to 15 Leonid meteors every hour on those mornings. ...

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• COROT-7b: Exoplanet with a sky made of stone | Astronotes
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• constellations | Astronotes - Part 2

... The Witch Head Nebula . ... Explanation: Double, double toil and trouble; Fire burn, and cauldron bubble -- maybe Macbeth should have consulted the Witch Head Nebula. ... More formally known as IC 2118 , the Witch Head Nebula glows primarily by light reflected from Rigel , located just outside the top right corner of the above image . ... The blue color is caused not only by Rigel's blue color but because the dust grains reflect blue light more efficiently than red. ...

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• APOD: September 25, 1997 - T Pyxidis: Recurrent Nova
• APOD: December 6, 1999 - M83: The Southern Pinwheel Galaxy from VLT
• APOD: May 25, 1998 - M83: A Barred Spiral Galaxy

... Words . ... Data Collection and Analysis . AAS 225 . ... The data below shows the most-popular words used in tweets about the 225th meeting of the American Astronomical Society . A number of common English words have been removed (including terms AAS225 , AAS and RT since they are very popular). ... To be included on this graph a word needs to appear at least times and the analysis was done on tweets. ... Here we restrict ourselves to those tweets not flagged by Twitter as being a re-tweet. ...

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• What are the popular words from #AAS221?
• What are the popular words from JWST@SXSW?
• What are the popular words from #AAS223?

... Recent Topics . ... MAO main . ... The third-order space-by-time relation . ... Тема: The third-order space-by-time relation . ... The mass m experiences a gravity force toward the sun and . ... will experience the Coriolis force or Coriolis acceleration. ... differentiated space-by-time twice and discovered equation2. ... time differentiation of space-by-time. ... to be described by differentiated forces. ... third-order space-by-time relation. ... understand the third-order space-by-time relation....

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Astronomical Data Center . ... You can access the files described here in three ways: . ... Use CDS' VizieR Service at ADC to explore the data files. ... Get the data files via anonymous FTP. ... 1981) -------------------------------------------------------------------------------- Byte-per-byte Description of file : table1a Byte-per-byte Description of file : table1b -------------------------------------------------------------------------------- Bytes Format Units Label Explanations ...

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... To avoid extensive numerical calculations in the statistical simulations, we treat the continuous evolution of each binary component as a sequence of a finite number of basic evolutionary states (for example, main sequence, red (super)giant, helium (Wolf-Rayet) star,     hot WD), in which stellar parameters significantly differ from each other. ... Figure 2: Schematic representation of the typical evolutionary track of a massive binary system with normal and compact star stages indicated. ...

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• Galya Lipunova

Next: Tables in Image Up: No Title Previous: Data Structures . This Chapter describes the structure and use of tables in the MIDAS system. ... The table structure is outlined in section . Different functional aspects of the tables are described in sections (Input/Output), (Management) and (Operations). A review of the commands is given in section , a more detailed explanation is included in appendix A. Section describes format files to control input/output operations. ...

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• Purpose
• Terms Used to Describe Modules - Apache HTTP Server
• Terms Used to Describe Directives - Apache HTTP Server

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ... Resonant inverse Compton scattering above polar caps: Gap acceleration efficiency for young pulsars . ...

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• ATNF Colloquium
• The Effect of Synchrotron Losses on Multiple Diffusive Shock Acceleration
• Resonant inverse Compton scattering above polar caps: Gap acceleration

Geometric Algebra 2 Quantum Theory Chris Doran Astrophysics Group Cavendish Laboratory Cambridge, UK Spin · Stern-Gerlach tells us that electron wavefunction contains two terms · Describe state in terms of a spinor S N · A 2-state system or qubit MIT2 2003 2 Pauli Matrices · Operators acting on a spinor must obey angular momentum relations · Get spin operators · These form a Clifford algebra · A matrix representation of the geometric algebra of 3D space ...

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• http://www.mrao.cam.ac.uk/wp-content/uploads/2014/04/VBourrier.pdf
• ALMA Phase Calibration Techniques at the Cavendish Astrophysics Group
• OptInt PmWiki : Delay Line Software Libraries | History

New GCVS Versions for Three Southern Constellations Peremennye Zvezdy (Variable Stars) 27, No. ... We are currently working on a version of the General Catalogue of Variable Stars (GCVS) revised taking into account the new data accumulated since the 4th GCVS edition. ... It will contain all stars of the 4th GCVS edition plus a complete catalogue of the stars added to the GCVS in the Name Lists of Variable Stars Nos. ...

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... Watchouts . ... The explanation below (under "FORMER EXPLANATION") was made obsolete by the release of the patch to SAS 6.5 - A new set of CCFs describing the MOS redistribution function (EMOS[1-2]_REDIST_00[65][74]) has been made public, to be used with a patched SAS 6.5, on December 1st, 2005. If you get the error "UnsupportedAlgoId" after this date it is due to the presence of those files in your CCF repository. ... FORMER EXPLANATION: . ... Pages maintained by SAS librarian . ...

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• Description
• Introduction.
• Procedure