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White Dwarf
The dense, hot core left behind after a low- or intermediate-mass star expels its outer layers. White dwarfs are composed mostly of electron-degenerate matter and no longer undergo fusion.
Source: chandra.harvard.edu
APODs including "White Dwarf"
RCW 86: Historical Supernova Remnant
10/11/2011
GK Per: Nova of 1901
05/11/2011
HH-222: The Waterfall Nebula
24/10/2011
A Young Supernova in the Nearby Pinwheel Galaxy
26/08/2011
Shapley 1: An Annular Planetary Nebula
16/08/2011
MyCn18: An Hourglass Planetary Nebula
07/08/2011
Supernova Sonata
26/05/2011
Tycho's Supernova Remnant
30/04/2011
Methuselah Nebula MWP1
21/10/2010
The Medusa Nebula
12/06/2010
Pauli Exclusion Principle: Why You Don't Implode
28/02/2010
NGC 2440: Cocoon of a New White Dwarf
21/02/2010
Dust and the Helix Nebula
31/12/2009
Dawn Before Nova
17/11/2009
The Center of Globular Cluster Omega Centauri
14/09/2009
SN 1006 Supernova Remnant
01/08/2009
SNR 0104: An Unusual Suspect
12/06/2009
The Helix Nebula from La Silla Observatory
03/03/2009
NGC 7008: The Fetus Nebula
25/08/2008
IC 4406: A Seemingly Square Nebula
27/07/2008
SN 1006 Supernova Remnant
04/07/2008
Supernova Factory NGC 2770
18/01/2008
Double Supernova Remnants DEM L316
15/01/2008
The Medusa Nebula
23/11/2007
Monitoring M2-9
18/06/2007
Dust and the Helix Nebula
23/02/2007
Nova Over Iran
19/02/2007
Planetary Nebula NGC 2440
15/02/2007
Kepler's Supernova Remnant in X-Rays
16/01/2007
Four Supernova Remnants
28/07/2006