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Cosmology/Deep Fields/X-ray Background :: The sky as observed in X-rays is not dark, but gives off a glow thought to be from many distant sources. Deep surveys with the Chandra X-ray Observatory should reveal the cause of this glow.

Image Date Title Org.
--2020--
Cases of Black Hole Mistaken Identity 15 Jul 20 Cases of Black Hole Mistaken Identity NASA/CXC 
Universe's Expansion May Not Be The Same In All Directions 08 Apr 20 Universe's Expansion May Not Be The Same In All Directions NASA/CXC 
--2019--
Heart of Lonesome Galaxy is Brimming with Dark Matter 03 Jun 19 Heart of Lonesome Galaxy is Brimming with Dark Matter NASA/CXC 
Where is the Universe Hiding its Missing Mass? 14 Feb 19 Where is the Universe Hiding its Missing Mass? NASA/CXC 
Astronomers Find Dark Energy May Vary Over Time 29 Jan 19 Astronomers Find Dark Energy May Vary Over Time NASA/CXC 
--2018--
Scientists Surprised by Relentless Cosmic Cold Front 03 Apr 18 Scientists Surprised by Relentless Cosmic Cold Front NASA/CXC 
--2017--
A New Twist in the Dark Matter Tale 19 Dec 17 A New Twist in the Dark Matter Tale NASA/CXC 
Early Black Holes May Have Grown in Fits and Spurts 31 May 17 Early Black Holes May Have Grown in Fits and Spurts CXC 
Mysterious Cosmic Explosion Puzzles Astronomers 30 Mar 17 Mysterious Cosmic Explosion Puzzles Astronomers CXC 
Deepest X-ray Image Ever Reveals Black Hole Treasure Trove 05 Jan 17 Deepest X-ray Image Ever Reveals Black Hole Treasure Trove CXC 
--2016--
Record-breaking Galaxy Cluster Discovered 30 Aug 16 Record-breaking Galaxy Cluster Discovered CXC 
NASA Telescopes Find Clues For How Giant Black Holes Formed So Quickly 24 May 16 NASA Telescopes Find Clues For How Giant Black Holes Formed So Quickly NASA 
28 Apr 16 "Russian Doll" Galaxy Clusters Reveal Information About Dark Energy CXC 
--2011--
NASA's Chandra Finds Massive Black Holes Common in Early Universe 15 Jun 11 NASA's Chandra Finds Massive Black Holes Common in Early Universe NASA 
--2010--
Black Hole Jerked Around Twice 21 Jul 10 Black Hole Jerked Around Twice CXC 
--2009--
Galaxies Coming of Age in Cosmic Blobs 24 Jun 09 Galaxies Coming of Age in Cosmic Blobs CXC 
Ghost Remains After Black Hole Eruption 28 May 09 Ghost Remains After Black Hole Eruption CXC 
--2008--
Dark Energy Found Stifling Growth in Universe 16 Dec 08 Dark Energy Found Stifling Growth in Universe NASA 
--2007--
GOODS Missing Black Hole Report: Hundreds Found! 25 Oct 07 GOODS Missing Black Hole Report: Hundreds Found! JPL 
New Panorama Reveals More Than a Thousand Black Holes 12 Mar 07 New Panorama Reveals More Than a Thousand Black Holes CXC 
--2006--
Chandra Independently Determines Hubble Constant 08 Aug 06 Chandra Independently Determines Hubble Constant CXC 
--2005--
Era of Galaxy and Black Hole Growth Spurt Discovered 06 Apr 05 Era of Galaxy and Black Hole Growth Spurt Discovered NASA 
NASA Observatory Confirms Black Hole Limits 15 Feb 05 NASA Observatory Confirms Black Hole Limits NASA 
--2004--
Spitzer Space Telescope Leads NASA's Great Observatories to Uncover Black Holes and Other Hidden Objects in the Distant Universe 01 Jun 04 Spitzer Space Telescope Leads NASA's Great Observatories to Uncover Black Holes and Other Hidden Objects in the Distant Universe STScI 
--2003--
The Secret Lives Of Galaxies Unveiled In Deep Survey 19 Jun 03 The Secret Lives Of Galaxies Unveiled In Deep Survey NASA 
Chandra Sees Shape of Universe During Formative, Adolescent Years 25 Mar 03 Chandra Sees Shape of Universe During Formative, Adolescent Years GSFC 
--2002--
Chandra Discovers 31 Jul 02 Chandra Discovers "Rivers Of Gravity" That Define Cosmic Landscape NASA 
--2001--
Deepest X-Rays Ever Reveal universe Teeming With Black Holes 13 Mar 01 Deepest X-Rays Ever Reveal universe Teeming With Black Holes NASA 
--2000--
Chandra Survey of Distant Galaxies Provides Evidence for Vigorous Starbursts 17 May 00 Chandra Survey of Distant Galaxies Provides Evidence for Vigorous Starbursts CXC 
Chandra Resolves Cosmic X-ray Glow and Finds Mysterious New Sources 13 Jan 00 Chandra Resolves Cosmic X-ray Glow and Finds Mysterious New Sources CXC