Introduction to neutron stars, pulsars, and quasars:

1.     http://www.youtube.com/watch?v=ow9JCXy1QdY

2.     http://www.youtube.com/watch?v=Vl_jL4WfVUM

3.     http://phys.org/news/2011-06-astronomers-universe-distant-quasar.html

4.     http://www.youtube.com/watch?v=Et9Nnr86dVQ&feature=related
5.     http://www.youtube.com/watch?v=jBX6WOK72Kg&feature=related      (pulsars and neutron stars)
6.     http://www.youtube.com/watch?v=4LmIyMyAuN0&feature=related   (quasars detail)