Distant Supernova Dark Energy. “Light from a star that exploded over 10 billion light-years away is revealed in… a cosmic snapshot of the most distant
supernova. The ancient stellar detonation was detected by digitally subtracting before and after images of a faint, yellowish, elliptical galaxy included in the
Hubble Space Telescope Deep Field image… Remarkable in itself as the farthest known supernova, its measured brightness
provides astounding evidence for a strange universe – one which eventually defies gravity and expands at an accelerating rate. The unseen force driving this
expansion is dubbed dark energy and discovering the fundamental nature of dark energy has been called the challenge of this millennium. Astronomy Picture of the Day