Changes

The total cost to NASA has been about $9 billion.<ref> Dennis Overbye, [http://www.astromart.com/news/news.asp?news_id=746 "One Last Ride to the Hubble," ''New York Times'' Dec 4, 2007]</ref>

The total cost to NASA has been about $9 billion.<ref> Dennis Overbye, [http://www.astromart.com/news/news.asp?news_id=746 "One Last Ride to the Hubble," ''New York Times'' Dec 4, 2007]</ref>

The Hubble has a 94-inch mirror. Earth-based telescopes with three times the diameter cost only 2% as much, but are affected by distortions caused by the atmosphere.  Astronomers hope that new methods of adaptive optics will improve the resolution of earth-based telescopes, because funding on the scale of Hubble is very unlikely to be available.

The Hubble has a 94-inch mirror. Earth-based telescopes with three times the diameter cost only 2% as much, but are affected by distortions caused by the atmosphere.  Astronomers hope that new methods of adaptive optics will improve the resolution of earth-based telescopes, because funding on the scale of Hubble is difficult to achieve. 

 

Hubble's successor will be the James Webb Space Telescope (JWST) is a large, infrared-optimized space telescope, scheduled for launch in 2014. Its mirror will be 6.5 meters.<ref> See [http://www.jwst.nasa.gov/ The James Webb Space Telescope]</ref>

 

== Photography ==

== Photography ==

'''The Hubble Ultra Deep Field''' is a picture taken by [[Hubble Telescope]]'s Advanced Camera for Surveys (ACS) and the Near Infrared Camera and Multi-object Spectrometer (NICMOS) of an "empty area" one tenth the diameter of a full moon when viewed from Earth. The 11.5 square [[arc minute]] area is equivalent to a grain of sand held at arm's length. Taken over a period of almost 11 days, the picture required 400 orbits around Earth and 800 exposures, which is equivalent to approximately 1 million seconds of exposure time. With an estimated 10,000 [[galaxy|galaxies]] in this image, nearly every speck of light is an entire galaxy or group of galaxies.

'''The Hubble Ultra Deep Field''' is a picture taken by [[Hubble Telescope]]'s Advanced Camera for Surveys (ACS) and the Near Infrared Camera and Multi-object Spectrometer (NICMOS) of an "empty area" one tenth the diameter of a full moon when viewed from Earth. The 11.5 square [[arc minute]] area is equivalent to a grain of sand held at arm's length. Taken over a period of almost 11 days, the picture required 400 orbits around Earth and 800 exposures, which is equivalent to approximately 1 million seconds of exposure time. With an estimated 10,000 [[galaxy|galaxies]] in this image, nearly every speck of light is an entire galaxy or group of galaxies.