Post by glactus on May 27, 2011 1:39:02 GMT
Hubbble Space telescope
The Hubble Deep Field is an image of a small region in the constellation of Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, two parts in a million of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres.
The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known.
The ultra deep field. Every dot is a galaxy
The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.
Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the universe (the cosmological principle).
The Hubble deep fied
A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra Deep Field (HUDF), was constructed from a total of eleven days of observations. The HUDF image is the deepest (most sensitive) astronomical image ever made at visible wavelengths.
To see movies click on the URL below. has sound.
www.youtube.com/watch?v=fgg2tpUVbXQ&NR=1
www.youtube.com/watch?v=PhoJCJZNi8Q&NR=1
www.youtube.com/watch?v=mQk8vV5ILnQ&NR=1
Hubble
Credits: These are NASA/Hubble images
Text: Wikipedia
Movies by Youtube