ASTRONOMY:
Exploding Stars Flash New Bulletins From Distant Universe
James Glanz
Four months after observations of distant supernovae indicated that the expansion of the universe is accelerating, new analyses of the data have added details to the picture. They have hinted that we might live in a "Hubble bubble"--a region that is expanding slightly faster than the universe as a whole--yielded clues to just what kind of energy might be filling space and causing the acceleration, and offered a preliminary assessment of the universe's total density of energy and matter.