The Hubble Deep Field (HDF) is an image of a small region in the constellation 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
![](http://up.wiki.x.io/wikipedia/commons/thumb/5/5f/HubbleDeepField.800px.jpg/400px-HubbleDeepField.800px.jpg)
![](http://up.wiki.x.io/wikipedia/commons/thumb/0/03/HDF_extracts_showing_many_galaxies.jpg/400px-HDF_extracts_showing_many_galaxies.jpg)
The Hubble Deep Field (HDF) is an image of a small region in the constellation 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