Variable Stars are stars that fluctuate in brightness. Plotting these changes result in a light curve. The AAVSO has a database of light curves available for the amateur interested in Variable Star study.

Blue Stragglers are a new type of star discovered in globular clusters - they have their own website!
 

The Hubble Space Telescope Institute has put together a really nice animation of the black hole that sits at the core of Centaurus A. Click on the image to view the video.

Black Hole stuff - Falling Into a Black Hole - what's it like?

Other great sites:

• A webpage designed to calculate a stars position on the H-R diagram - The H-R Diagram Calculator
• Instructional - AAVSO Light Curves
• Instructional - Folded Light Curves
• MK Standard Stars - used for UVBRI photometry
• Swinburne University's Pulsar Group
• Simulating the First Stars in the Universe
• ESA's Hipparcos Mission
• COMPLETE - COordinated Molecular Probe Line Extinction Thermal Emission survey of star forming regions

Supernova:

A quick refresher:

• High Redshift Supernova Search - Supernova Cosmology Project
• SNAP - Supernova Acceleration Probe (Dark Energy Search)

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