... January 5, 1997 . Too Close to a Black Hole . ... Explanation : What would you see if you went right up to a black hole ? ... On the right is the same star field but this time with a black hole superposed in the center of the frame. The black hole has such strong gravity that light is noticeably bent towards it - causing some very unusual visual distortion. In the distorted frame, every star in the normal frame has at least two bright images - one on each side of the black hole . ...

This is the homepage of Andrew Fruchter, an astronomer on the staff of the Space Telescope Science Institute . ... Here you can look at an HST images of the optical counterparts of gamma-ray bursts and their host galaxies. ... Therefore, substantial information on the fine scale structure of objects can be obtained by offsetting the pointing of the telescope between exposures and then combining these "dithered" exposures into a single image. ...

Next: Silicate minerals Up: A Database of Optical Previous: Database of Optical Properties . ... If necessary, data have been determined for the different crystallographic axes. ... In the following we give some examples of the data and their possible applications. Table: Summary of data measured in the Jena laboratory, which are currently available from the JPDOC. compound . ... amorph. ... Next: Silicate minerals Up: A Database of Optical Previous: Database of Optical Properties root 2003-03-06 ...

Over the coming weeks an international team, including Simon Jeffery , Vincent Woolf and Amir Ahmad of the Armagh Observatory, will use over fifteen different telescopes to make over one hundred nights of observations of just one star to learn about its internal structure. ... Although the approach has been used before, this may be the first time that a global asteroseismology project has tried to measure both light and spectrum variations at the same time for any star apart from the Sun. ...

... Too Close to a Black Hole . ... On the right is the same star field but this time with a black hole superposed in the center of the frame. ... Black holes are thought to be the densest state of matter, and there is indirect evidence for their presence in stellar binary systems and the centers of globular clusters, galaxies, and quasars. ... NASA Official: Jay Norris. ... Publications with keywords: black hole - gravitational lens . Publications with words: black hole - gravitational lens . ...

. To you, the user, it appears as though there is only one type of file in UNIX - the file which is used to hold your information. In fact, the UNIX filesystem contains several types of file. Ordinary files . Directories . Special files . Pipes .

Next: An example of Up: Association of images Previous: Association of images . The two sets of selection criteria (``first choice'' and ``second choice'') have to be entered in a table containing four columns: . FUNCTION --character column (max 256 char) . This column defines the different selection criteria and shall contain mathematical expressions in which the variables may be the columns of the OST. ... RANGE_1 --character column (max 256 char) . ... WEIGHT --real column . ...

... The visibility datasets possibly contain correlations for different polarizations and Stokes parameters. There are two basic ways that polarization characteristics can be measured: firstly, two orthogonal feeds can be present on the antennas, and the four different polarization correlations from a baseline can be taken and recorded. ... There are two ways the user can determine which polarizations he or she wants to process, either with the select parameter, or with the stokes parameter. ...

... A detector map is used to provide a grid of positions over which to calculate and flux weight the ARF. The default detector map is 'flat' which has a weighting of 1.0 for each detector map pixel and is rectangular having sides which just encompass the region specified in the DSS. Only detector map pixels falling within the source region are included in the ARF calculation, e.g. for a circular source box, the pixels in the corners of the detector map will be ignored. ... flat : . ...

Profile" is a proposed multi-spacecraft mission to the Earth's magnetosphere. ... Click here for that list, also listed as appendix to "Science Closure" of the "" Multiprobe Mission " below. The 1997 Fall Meeting of the AGU , held in San Francisco December 8-12, included a special session Science Closure and Enabling Technologies for Magnetospheric Constellation Missions At that session, a talk and a poster on "Profile" were presented by D.P. Stern: . ... Science Tasks for "Profile". ...

Blackholes2 Forum Message . ... Post . ... A Field Does Not Contain Energy? ... Post Message | ... Here are two sites of many which use rest mass terminology. http://www.iop.org/EJ/abstract/0026-1394/41/5/S04/ . ... This site refers to the energy contained in a static gravitational field. http://www.ias.ac.in/currsci/mar25/articles27.htm . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Modules . ... Description: . ... This module is designed for the use in test suites and large networks which have to deal with different httpd versions and different configurations. ... IfVersion [[!] operator ] version > .. ... httpd version is equal . ... Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our mailing lists . ...

Gain curves for various receivers and freq (ps) ( .pdf ) are plotted versus zenith angle. (last updated 22nov05) . ... The colors are for different receivers. For the same receiver, different frequency measurements use different plotting symbols. ... The solid line has averaged over azimuth, the dashed line has taken the maximum azimuth value for each measurement (all at a za of 10 degrees). ... For more info on the gain curve fits and their location see gain curves fits at ao . ...

T his page contains synthetic Hertzsprung-Russell Diagrams (HRDs) for a simulated Star Forming Region, assuming different scenarios and timescales for the history of star formation. ... In the paper we only presented the best fits to the HRD of the CMa R1 Star Forming Region. ... Download movie (1.90 MB) . Scenario II: Constant rate of star formation during a time interval delta t . delta t = 0.1 Myr . ... Scenario IV: Linearly decreasing rate of star formation during a time interval delta t . ...

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 . ...

... Users . ... The graph below represents the connections between users tweeting about JWST@SXSW . ... Stop Start . ... The links between the nodes identify those users who have mentioned another user in a tweet, using the @name syntax; the line widths increase based on the number of mentions but given that the graph is ever-so-slightly crowded this isn't that useful at this time. ... This visualization was created using the d3.js JavaScript library, and is based on the force-directed graph example . ...

README FILE FOR OK.WAD -======================- by Scott Adams scotta@netcom.com This file contains 6 PWADS for DOOM that, unless I've missed a bug, are without bugs. Intentionally, they are very basic and short. They are intended for the beginning DEU user, and illustrate some techniques that can be used to achieve different effects without too much effort. ... There are, intentionally, no enemies, since they are quite easy to add and can get in the way sometimes. ...

... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... The Horsehead Nebula in Orion . ... Astronomy 101 . ... Astronomy Day . ... NASAт??s Hubble sees a horsehead of a different color . ... Looking like an apparition rising from whitecaps of interstellar foam, the iconic Horsehead Nebula has graced astronomy books ever since its discovery over a century ago. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

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The stars evolution is a change with a caurse of time the physical characteristics and the cemical composition of the stars. The stars evolution on the base of physical characteristics composition is investigated when the stars are at the different steps of evolution. ... The star evolution is going in the compact double star system in its own ways. Back . ...