... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

. To append the standard output from a command to a file use two >> (greater than) symbols followed by the name of the file. If the file does not exist it is created. For example: cat part1 > chapt2 cat part2 >> chapt2 . This creates a file called chapt2 with the same contents as part1 . It then reads the contents of part2 and appends them to the file chapt2 . The file chapt2 now contains the data from part1 followed by the data from part2 .

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Miscellaneous Documentation . ... This page documents all the relevant standards that the Apache HTTP Server follows, along with brief descriptions. ... http://www.rfc-editor.org/errata.php - RFC Errata . ... This document summarizes the history of HTML development, and defines the "text/html" MIME type by pointing to the relevant W3C recommendations. ... HTML documents are SGML documents. ...

... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 > Miscellaneous Documentation . ... This page documents all the relevant standards that the Apache HTTP Server follows, along with brief descriptions. ... http://www.rfc-editor.org/errata.html - RFC Errata . ... This document summarizes the history of HTML development, and defines the "text/html" MIME type by pointing to the relevant W3C recommendations. ... HTML documents are SGML documents. ...

... Developments within the past triennium The 2 most significant activities of the WG during the 2006-2009 triennium were to produce a new version of the formal FITS standard document, which precisely defines the requirements of the FITS format, and to create a new registry for documenting existing FITS conventions. ... The registry provides a convenient central location for documenting the various FITS keywords or other FITS data structures that are used by each convention. ...

... News Latest News News Archive Newsletter Quarterly Status Report . ... Calibration strategy, status and factors limiting success: Chandra . ... Calibration strategy, status and factors limiting success: XMM-Newton . ... Calibration strategy, status and factors limiting success: Swift . ... Calibration strategy, status and factors limiting success: RXTE . ... Calibration strategy, status and factors limiting success: Suzaku . ... Calibration strategy, status and factors limiting success: Integral . ...