... Situated over 2,000,000,000 (two billion) light-years from Earth, galaxies in cluster Abell 2390 (top) and MS2137.3-2353 (bottom) are seen in the right hand panels above, false-color images from the Hubble Space Telescope. ... Bright gas and dark dust permeate the space between stars in a nebula known as NGC 6559. ... This mosaic of x-ray images cuts a swath across the photogenic Rosette Nebula, a stellar nursery 5,000 light-years from Earth in the constellation Monoceros, the Unicorn. ...

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... HST . What is the meaning of the 2x2 resolution element in the ACS ETC for an extended source ? ... HST Peer Review Process . ... HST Overview . ... What do I do if my source is larger than the 2x2 element ? When you are using any ACS ETC (imaging, spectroscopic or ramp) with an extended source, the ETC does all calculations for a boxsize of 2x2 pixels, or one resolution element. ... The 101x101 box is 2500 time the size of one resolution element and the square root of 2500 is 50.) ...

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• Limitations on the Calibration Accuracy for COS/FUV Observations of Extended
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... 2001 February 16 . Star Forming Region Hubble-X . ... Cataloged as Hubble-X , many skygazers find the appearance of this extragalactic star forming region reminiscent of the most famous stellar nursery in our own galaxy, the Orion Nebula . Hubble-X is intrinsically much brighter than Orion though, and at a distance of 1.6 million light-years it is about 1,000 times farther away. Hubble-X is also about 100 light-years across compared to 10 light-years for the Orion Nebula. ... About APOD | ...

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• APOD: 2012 February 20 - Barred Spiral Galaxy NGC 1073
• APOD: 2014 February 14 - IC 1805: Light from the Heart
• APOD: 2009 February 22 - Orion Nebula: The Hubble View

... Bruce MacA Thomas 11 February 1999 Introduction In this discussion document, the antenna principles underpinning some of the concepts discussed in Ref 1 for the LF-SKA are extended to illustrate the potential difficulty of achieving constant collecting area, and hence the practical realisation of the "magic-carpet" concept. Applications to the "randomised" antenna-element approach to array-station design, and the trade-offs that need to be considered, are briefly discussed. ...

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... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 February 28 . The Sombrero Galaxy from VLT . ... FORS1 , VLT ANTU , ESO . ... Reasons include the Sombrero 's unusually large and extended central bulge of stars, and dark prominent dust lanes that appear in a disk that we see nearly edge-on. Billions of old stars cause the diffuse glow of the extended central bulge. ... About APOD | ...

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• Hubble Observations Shed New Light on Jupiter Collision
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... Armagh Planetarium . ... Universe . ... Posted on March 18, 2011 | ... Continue Reading.. ... 11 Comments тАЬIs there life on Mars?тАЭ This must be one of the most-asked questions in astronomy. €аIn this article I am going to look at the historical background to this question. ... Posted on February 28, 2011 | ... 170 Comments Apollo 18 is a SF/Horror movie presented as newly-found film footage taken by the fictional crew of a lost 1970s lunar landing mission.€а The Apollo 18 film uses real NASA [ ]...

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• Comet ISON Puts on a Show for Hubble | Astronotes
• Nick Parke | Astronotes - Part 2

. [ Go back to Comet Center Home Page ] . Andrew A. Martis . martis@sai.msu.su .

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• Block Quotes
• The Body Element and Related Elements
• Table Rows

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

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... The shining stars and swirls of glowing gas in this picture make up part of the beautiful Seagull Nebula. ... This picture actually shows just a small part of the nebula, can you guess which part? ... The colour tells astronomers that what we're looking at is hydrogen the most common element in the Universe. There are lots of materials on Earth, but did you know that when you break them down they're all made from just a few basic chemicals? We call these chemicals 'elements'. ...

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• ESO - E-ELT Science Instrumentation, 25 Feb - 1 Mar 2013
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The beam pattern and the polarization characteristics . of the radio telescope RATAN-600 . The Mueller matrix elements was computed via formulas [1]: . ... The BP were computed by the aperture method, proceeding from the fild distribution in the aperture of the primary mirror. The components of the main and cross-polarization components of the electric field in the vertical aperture of the primary mirror was computed in Frenel diffraction approximation. ...

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• di_eks
• My publications

ALMA/Hubble composite image of the gravitationally lensed galaxy SDP.81. The bright orange central region of the ring (ALMA's highest resolution observation ever) reveals the glowing dust in this distant galaxy. ... The diffuse blue element at the center of the ring is from the intervening lensing galaxy, as seen with the Hubble Space Telescope. ALMA (NRAO/ESO/NAOJ); B. Saxton NRAO/AUI/NSF; NASA/ESA Hubble, T. Hunter (NRAO) ...

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• Hubble confirms that galaxies are the ultimate recyclers | Astronomy.com
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• What is the heaviest element that astronomers can detect? | Astronomy.com

This is a color composite image made by Karen Gloria at Hopkins Observatory using a 6-inch refractor and a 512x512 element CCD detector. ... This is a planetary nebula (see also the Planetary Nebula page on this server). It is relatively small, measuring approximately 8x4 arcminutes. Overall, the surface brightness of the extended ionized gas emission is one of the highest for any PN and therefore this object is easily seen through even small telescopes (including most finders). ...

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• THE HUBBLE LAW JAVA APPLET
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home publications > mercury . ... ASP Conference Series . ... Cooking Up Heavy Elements in the Cosmos . ... Generally, only a few exceptionally inquisitive students venture beyond the simple statement to ask the question: "If massive stars can only fuse elements up to iron in their cores, then how do we get all the elements heavier than iron?" ... Furthermore, most of us are familiar with the thermonuclear fusion processes that take place in the cores of stars and generate the elements up to iron. ...

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• ASP: An Ancient Universe - The Age of the Chemical Elements
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... Format of the orbital elements | Estimation of the extrapolation errors | Version 1" of the orbital elements collection, determined by KIAM during flight and used for operations planning . Version 2" of the of the orbital elements collection, modified by IKI during flight and recommended for the orbital calculations during scientific data processing . ... Three kinds of the INTERBALL Auroral probe (IB_AUR) orbital elements' collections are presented here. ... IKI RAN | SSC IKI RAN | ...

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• The INTERBALL Tail PROBE orbital elements
• About modification of the INTERBALL orbital elements
• INTERBALL Auroral probe (INTERBALL 2) post-flight orbital elements collection

... self-absorption - the absorption of light shining on an object by a process similar to that which produced the light originally; if a cloud emits less light than it absorbs from other clouds behind it, this net loss of light, termed self-absorption , causes the foreground cloud to appear darker than the background field (the term is from spectroscopy, where small absorption dips sometimes occur in larger emission lines, making the latter look as if it is absorbing part of itself) . ... HISA Main ...

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• Hydrogen Shadows in the Galactic Sky
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• The Pleiades

Core vehicle of the OS was launched on February 20, 1986 from the launching pad Baikonur by the launch vehicle Proton-K. It is the central binding element of the complex. The mass of the vehicle at launch was equal to 21000 kg; fuel mass- 1200kg. It has two main solar batteries' panels with area equal to 2*38 m 2 (capacity -9 kW) and additional panel fixed by the cosmonauts. ... Module has 6 docking ports (2 axial and 4 outlying) to dock the transportation ships and additional modules. ...

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... Pluto's orbit is also highly inclined -- tilted 17 degrees to the orbital plane of the other planets. ... Ground-based observations indicate that Pluto's surface is covered with methane ice and that there is a thin atmosphere that might freeze and fall to the surface as the planet moves away from the Sun. ... This is the first image-based surface map of the solar system's most remote planet, Pluto. ... This is the first surface map of Charon, the moon of the solar system's most remote planet, Pluto....

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• International workshop “Europa lander: science goals and experiments”
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The AstroGuide . ... AstroGuide | ... AstroGuide Listing . Login . See many more Astronomy Listings by: Category or Alphabet . A collection of high quality Hubble Space Telescope images. ... Listed Since February 16, 1999 . ... Web Site . ... However, you must Login to submit a comment. ... Web . ... 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 ...

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• Blackholes Discussion Forum - Hosted by The Astronomy Net
• Black Holes And RedShift - an Astronomy Net Blackholes Forum Message

... Calibration and analysis of this observation posed very interesting challenges for the authors, in particular dealing with an exciting new instrument whose on-orbit calibration was not yet well defined. ... Five mosaic positions were observed during five consecutive orbits as well as observations for dark and flat calibration. ... Darks and flats had to be created from contemporaneous reference observations and problems within the calibration process had to be resolved. ...

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• Improvements in Filter Design for Removing Galactic ``Cirrus'' from IRAS Images
• Hubble Space Telescope Telemetry Access using the Vision 2000 Control Center
• New Elements of Sherpa, CIAO's Modeling and Fitting Tool

... The function sorts the array values: if the number of elements is odd, the central element of the sorted list is returned; if even, the element in the lower of the two central elements is returned. interface median real(single) function medianVector(array) real(single), intent(in) :: vector(:) end function medianVector real(single) function medianArray(array) real(single), intent(in) :: array(:,:) end function medianArray end interface . ...

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• Overview of main screen elements