Astronomy is the natural science which has to do with the study of stars, planets, comets, galaxies, and nebulae, along with other celestial objects which are from outside the earth's atmosphere.
Regular Blogs
Entries are about space shuttle launches, space exploration, and astronomy in general. The scientist blogger also includes numerous photographs about the topics.
http://apollogeek.blogspot.com/
Biologist and amateur astronomer in South Australia discusses comets, constellations, and sunspots.
http://astroblogger.blogspot.com/
The author of this blog usually writes about astronomy as it relates to the United Kingdom and addresses such topics as the moon, Cassini, and space in general.
http://www.strudel.org.uk/blog/astro/
This science blog explores the latest science and astronomy discoveries. The blog has recently commented on discoveries of new planets near the star Fomalhaut and space shuttle missions. The blog also looks at how RCW catalogue has expanded to take account of new astronomical discoveries.
http://www.strudel.org.uk/blog/astro/index.shtml
Based in the United Kingdom, the entries here are about astronomy in general, and specifically about galaxies, the moon, NASA, and gravity.
http://www.strudel.org.uk/blog/astro/index.shtml
Dedicated to space history and artifacts. The sightings section of website helps you find out about upcoming appearances of astronauts. The website also has information on astronaut biographies such as Buzz Aldrin's "Men from Earth".
http://www.collectspace.com/
This is a collaborative effort, with various NASA supporters and fans writing the blogs in an effort to encourage people to stay abreast of NASA's operations and explorations.
http://www.nasawatch.com/
Displays images of planets, craters, and the night skies, along with lengthy descriptions of what is happening in the photographs.
http://jtintle.wordpress.com/
The official blog of the Planetary Society delves into news about astronomy and planetary excursions, and gives details about the Hubble space telescope, Mars Odyssey, and the potential threat of asteroids.
http://planetary.org/blog/