Astronomy

We review properties of theories for the variation of the gravitation and fine structure 'constants'. We highlight some general features of the cosmological models that exist in these theories with reference to recent quasar data that are consistent with time-variation in the fine structure 'constant' since a redshift of 3.5. The behaviour of a simple class of varying-alpha cosmologies is outlined in the light of all the observational constraints.

The classic simulation

In the wake of Shepard Fairey's debacle with the AP over the rights to the image he used as reference/inspiration for his wildy popular Obama poster, I wanted to share a list of Public Domain Licensed images, in this case, astronomy. Fairey's situation should hit home with all pixel junkies out there and remind us that we have to pay close attention to the licenses associated with the images we use in our design work. I've compiled a list of beautiful, inspiring astronomy images that all have a Public Domain License.

And though we may be away from those holographic representations, the Sloan Digital Sky Survey will soon be entering its third phase, in an attempt to create the biggest 3D map of the universe created so far.

a joint Fermilab/SLAC publication

The University of Arizona is honored to be the first public university to lead a mission to Mars. The Phoenix Mars Mission, scheduled to land May 25, 2008, is the first in NASA's "Scout Program." Scouts are designed to be highly innovative and relatively low-cost complements to major missions being planned as part of the agency's Mars Exploration Program.

The basic laws of physics work equally well forward or backward in time, yet we perceive time to move in one direction only-toward the future. Why?

For 25 years, the ADC was a key center for published astronomy data, catalogs, and journal tables. The ADC made these data sets computer readable and developed new methods, tools, and techniques for their preparation and use.

The CDS Service for astronomical Catalogues