To mark the end of the astronomy unit, here are a number of articles that are of interest:
Hubble’s Ultra Deep Field has been updated:
One physicist’s ideas about how time travel would have to work (no killing your own grandfather!):
Discover, Time Travel
WMAP is examining the Cosmic Microwave Background with enormous precision. Certain aspects of cosmology–like details about the Universe’s inflationary period–were hoped to be discovered. Unfortunately, the Universe is very good at hiding her secrets…
This is a really useful video about results from the Relativistic Heavy Ion Collider:
Also, there are always articles connected to Earth an the climate coming out.