Astronomy picture of the day

[RooJ]

http://antwrp.gsfc.nasa.gov/apod/ http://antwrp.gsfc.nasa.gov/apod/archivepix.html Anyone else keep an eye on this site? Some of the images are just mind blowing!! Like the hubble ultra deep field: http://antwrp.gsfc.nasa.gov/apod/ap040309.html To think nearly all those dots are entire galaxies , and that photo's just a small pencil beam of the sky... Ill quote from the hubble site: If astronomers made the Hubble Ultra Deep Field observation over the entire sky, how long would it take? The whole sky contains 12.7 million times more area than the Ultra Deep Field. To observe the entire sky would take almost 1 million years of uninterrupted observing. How wide is the Ultra Deep Field's slice of the heavens? The Hubble Ultra Deep Field is called a "pencil beam" survey because the observations encompass a narrow, yet "deep" piece of sky. Astronomers compare the Ultra Deep Field view to looking through an eight-foot-long soda straw. The Ultra Deep Field's patch of sky is so tiny it would fit inside the largest impact basin that makes up the face on the Moon. Astronomers would need about 50 Ultra Deep Fields to cover the entire Moon.