About iADD

Welcome to the Illinois Astrophysical Dynamics Demos! This is an educational web site dedicated to the use of simulations to teach astrophysics. The site is organized around several areas that are important in modern astronomy. Each offers visualizations of precomputed simulations for beginners and the opportunity to run your own simulations for the adventurous. Each area also features a description of the science involved in the simulations. One of our plans is to build lessons around the simulations hosted here that can be used in secondary and college-level coursework.

iADD is descended from the former Digital Demo Room at Illinois run by Prof. Charles Gammie's group.

Getting started

You can browse articles and precomputed simulations as a guest, but to explore more advanced features of the site you will need to register. It's free and will give you access to our online simulation tools and other features.

Terms of use

Please read our Terms of Use and Privacy Policy governing your use of this site. If you have questions or encounter problems, please contact us.

Debug Console

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$_GET
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21 Queries Logged: 0.016493320465088 seconds

  1. SELECT data
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  2. DELETE
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  5. SELECT session_id
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      LIMIT 1
  6. INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
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  11. SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
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      AND `c`.`published` = '1'
      AND `s`.`id` = '2'
      AND badcats.id is null
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      ORDER BY `c`.`lft` ASC
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      AND `element` = 'com_users'
  20. SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
      WHERE `m`.`published` = '1'
      AND `e`.`enabled` = '1'
      AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= '2025-04-21 08:02:31' )
      AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= '2025-04-21 08:02:31' )
      AND `m`.`access` IN ('1','1','4')
      AND `m`.`client_id` = '0'
      AND (`mm`.`menuid` = '7' OR `mm`.`menuid` <= '0' )
      ORDER BY `m`.`position` ASC,`m`.`ordering` ASC
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16 Query Types Logged, Sorted by Occurrences.

SELECT Tables:
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      FROM `jos_extensions`
  2. 2 × SELECT data
      FROM `jos_session`
  3. 1 × SELECT b.rules
      FROM `jos_assets` AS `a`
      LEFT JOIN jos_assets AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
  4. 1 × SELECT a.*,a.id,a.asset_id,a.title,a.alias,a.title_alias,a.introtext,a.fulltext,
      CASE WHEN badcats.id IS NULL THEN a.state ELSE 0 END AS state,a.mask,a.catid,a.created,a.created_by,a.created_by_alias,
      CASE WHEN a.modified IS NULL THEN a.created ELSE a.modified END AS modified,a.modified_by,a.checked_out,a.checked_out_time,a.publish_up,a.publish_down,a.images,a.urls,a.attribs,a.version,a.parentid,a.ordering,a.metakey,a.metadesc,a.access,a.hits,a.metadata,a.featured,a.language,a.xreference,c.title AS category_title,c.alias AS category_alias,c.access AS category_access,u.name AS author,parent.title AS parent_title,parent.id AS parent_id,parent.path AS parent_route,parent.alias AS parent_alias,ROUND(v.rating_sum / v.rating_count, 0) AS rating,v.rating_count AS rating_count
      FROM `jos_content` AS `a`
      LEFT JOIN jos_categories AS c
      ON c.id = a.catid
      LEFT JOIN jos_users AS u
      ON u.id = a.created_by
      LEFT JOIN jos_categories as parent
      ON parent.id = c.parent_id
      LEFT JOIN jos_content_rating AS v
      ON a.id = v.content_id
      LEFT
      OUTER JOIN (SELECT cat.id as id
      FROM jos_categories AS cat JOIN jos_categories AS parent
      ON cat.lft BETWEEN parent.lft
      AND parent.rgt
  5. 1 × SELECT c.*,
      CASE WHEN CHAR_LENGTH(c.alias) THEN CONCAT_WS(':', c.id, c.alias) ELSE c.id END as slug
      FROM `jos_categories` AS `c`
      LEFT JOIN jos_categories AS s
      ON (s.lft <= c.lft
      AND s.rgt >= c.rgt) OR (s.lft > c.lft
      AND s.rgt < c.rgt)
      LEFT JOIN (SELECT cat.id as id
      FROM jos_categories AS cat JOIN jos_categories AS parent
      ON cat.lft BETWEEN parent.lft
      AND parent.rgt
  6. 1 × SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
  7. 1 × SELECT a.rules
      FROM `jos_assets` AS `a`
  8. 1 × SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
      FROM `jos_menu` AS `m`
      LEFT JOIN jos_extensions AS e
      ON e.extension_id = m.component_id
  9. 1 × SELECT session_id
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  10. 1 × SELECT b.id
      FROM `jos_usergroups` AS `a`
      LEFT JOIN jos_usergroups AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
  11. 1 × SELECT *
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  12. 1 × SELECT folder AS type,element AS name,protected,params
      FROM `jos_extensions`
  13. 1 × SELECT jos_template_styles.id,jos_template_styles.home,jos_template_styles.template,jos_template_styles.params,jos_extensions.protected
      FROM `jos_template_styles`
      INNER JOIN jos_extensions
      ON jos_extensions.element = jos_template_styles.template
OTHER Tables:
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  2. 1 × INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('48fc61d6eff578c33da02dd2e051fbfa','0','1745222551','18.97.14.85'
  3. 1 × DELETE
      FROM `jos_session`
  • onAfterInitialise — Method — plgSystemP3p::onAfterInitialise → /core/plugins/system/p3p/p3p.php:21
  • onAfterInitialise — Method — plgSystemRemember::onAfterInitialise → /core/plugins/system/remember/remember.php:20
  • onAfterInitialise — Method — plgSystemHubzero::onAfterInitialise → /core/plugins/system/hubzero/hubzero.php:21
  • onAfterInitialise — Method — plgSystemXFeed::onAfterInitialise → /core/plugins/system/xfeed/xfeed.php:21
  • onAfterInitialise — Method — plgSystemSupergroup::onAfterInitialise → /core/plugins/system/supergroup/supergroup.php:113
  • onAfterInitialise — Method — plgSystemReferrerpolicy::onAfterInitialise → /core/plugins/system/referrerpolicy/referrerpolicy.php:21
  • onAfterRoute — Method — plgSystemJquery::onAfterRoute → /core/plugins/system/jquery/jquery.php:21
  • onAfterRoute — Method — plgSystemSpamjail::onAfterRoute → /core/plugins/system/spamjail/spamjail.php:21
  • onAfterRoute — Method — plgSystemIncomplete::onAfterRoute → /core/plugins/system/incomplete/incomplete.php:21
  • onAfterRoute — Method — plgSystemUnconfirmed::onAfterRoute → /core/plugins/system/unconfirmed/unconfirmed.php:21
  • onAfterRoute — Method — plgSystemUnapproved::onAfterRoute → /core/plugins/system/unapproved/unapproved.php:21
  • onAfterRoute — Method — plgSystemPassword::onAfterRoute → /core/plugins/system/password/password.php:21
  • onContentPrepare — Method — plgContentLoadmodule::onContentPrepare → /core/plugins/content/loadmodule/loadmodule.php:35
  • onContentPrepare — Method — plgContentEmailcloak::onContentPrepare → /core/plugins/content/emailcloak/emailcloak.php:25
  • onContentPrepare — Method — plgContentPagebreak::onContentPrepare → /core/plugins/content/pagebreak/pagebreak.php:35
  • onContentPrepare — Method — plgContentXhubtags::onContentPrepare → /core/plugins/content/xhubtags/xhubtags.php:25
  • onContentPrepare — Method — plgContentFormatwiki::onContentPrepare → /core/plugins/content/formatwiki/formatwiki.php:63
  • onContentPrepare — Method — plgContentFormathtml::onContentPrepare → /core/plugins/content/formathtml/formathtml.php:105
  • onContentPrepare — Method — plgContentExternalhref::onContentPrepare → /core/plugins/content/externalhref/externalhref.php:41
  • onContentBeforeDisplay — Method — plgContentPagenavigation::onContentBeforeDisplay → /core/plugins/content/pagenavigation/pagenavigation.php:25
  • onContentBeforeDisplay — Method — plgContentVote::onContentBeforeDisplay → /core/plugins/content/vote/vote.php:32
  • onAfterDispatch — Method — plgSystemMobile::onAfterDispatch → /core/plugins/system/mobile/mobile.php:22
  • onAfterDispatch — Method — plgSystemDebug::onAfterDispatch → /core/plugins/system/debug/debug.php:60
  • onAfterDispatch — Method — PlgSystemHighlight::onAfterDispatch → /core/plugins/system/highlight/highlight.php:25
  • onAfterRender — Method — plgSystemSef::onAfterRender → /core/plugins/system/sef/sef.php:21