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Line 13: == Problems == When the HST took its first pictures, astronomers were happy to see the images, but they were not as sharp and as crisp as expected. Telescopes in space can take better pictures than telescopes on Earth, but for some reason, the pictures were not better than the pictures taken on Earth. They found a problem with the telescope's mirror. The mirror was not curved right. It was only wrong by 2.2 [[micron]]s (1/50th as thick as a piece of paper). Still, this was enough to cause the images to be blurred. Some said that Hubble was [[myopia\|nearsighted]].<ref>{{cite web\|title=Hubble Essentials\|url=http://hubblesite.org/the_telescope/hubble_essentials/\|publisher=HubbleSite\|accessdate=31 March 2013}}</ref>▼ ~~When the HST took its first pictures, astronomers were happy to see~~ ▲the images, but they were not as sharp and as crisp as expected. Telescopes in space can take better pictures than telescopes on Earth, but for some reason, the pictures were not better than the pictures taken on Earth. They found a problem with the telescope's mirror. The mirror was not curved right. It was only wrong by 2.2 [[micron]]s (1/50th as thick as a piece of paper). Still, this was enough to cause the images to be blurred. Some said that Hubble was [[myopia\|nearsighted]].<ref>{{cite web\|title=Hubble Essentials\|url=http://hubblesite.org/the_telescope/hubble_essentials/\|publisher=HubbleSite\|accessdate=31 March 2013}}</ref> == Repair == Line 24 ⟶ 22: == Accomplishments == [[File:Sombrero Galaxy in infrared light (Hubble Space Telescope and Spitzer Space Telescope).jpg\|thumb\|Sombrero Galaxy in infrared light (Hubble Space Telescope and Spitzer Space Telescope)]] * Early on, in 1994, Hubble stared at what was thought to be an empty area of space for ten days. It found there were actually many galaxies even there, but very faint and very far away. No other telescope could have seen that.<ref>{{cite web\|title=Hubble Breakthroughs\|url=http://hubblesite.org/hubble_discoveries/breakthroughs/\|publisher=HubbleSite\|accessdate=31 March 2013}}</ref> * In 2004, Hubble looked back several billion years to the first galaxies in the [[Hubble Ultra Deep Field]]. * It was able to help settle the [[age of the universe]] at about 13.7 billion years. Before the Hubble, scientists only knew it was between 10 and 20 billion years old. Line 30 ⟶ 28: == Replacement == Hubble has been replaced by the [[James Webb Space Telescope]] which ~~has been~~is located even further from Earth. There are now other telescopes in orbit, like the [[Herschel Space Observatory]], the [[Spitzer Space Telescope]] and the [[Kepler (spacecraft)\|Kepler Spacecraft]], which was specially made for finding Earth-like planets around other stars.<ref>{{cite web\|title=Telescopes in Space\|url=http://www.space.com/6717-bounty-space-telescopes-fuels-golden-age-astronomy.html\|publisher=Space.com\|accessdate=31 March 2013}}</ref> == References ==

Hubble Space Telescope: Difference between revisions