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by 05annanda on February 5th, 2010
Telescopes were not advanced enough to show much detail in these deep sky objects, which appeared as fuzzy patches of grey light. These patches were named nebulae, and their nature was not fully realized by astronomers. They were thought to be relatively close to the Earth, although several of the observed “nebulae” were actually galaxies unknown at the time. By the mid 1800’s, the largest telescope in the world was a reflector with a mirror 183 centimetres across. Using this telescope, Lord Rosse of Ireland observed that several “nebulae” exhibited a spiral structure. It had been proposed 100 years earlier that many of these nebulae were actually island universes (now called galaxies), and Lord Rosse reiterated this belief. Astronomers remained divided over the possibility of island universes, however, and the issue remained unsettled until Edwin Hubble was able to estimate the distance to the Andromeda galaxy in 1923. He observed a certain kind of variable star which has a regular relationship between its luminosity and period, and using this relationship, estimated the Andromeda Galaxy was about 2.2 million light years away. Astronomers finally realized that many of the supposed “nebulae” were indeed island universes, or galaxies
by Anonymous on January 29th, 2010
It's the pair of huge telescopes on Hawaii.
by Phantom Answers on January 28th, 2010
A mountain in Hawaii?:)
Do teachers receive discount tickets at Kennedy Space Center?
by Answerbag Staff on June 25th, 2010
| 1 person likes this
How Can I Name A Star After Somebody?
by Answerbag Staff on December 21st, 2009
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How far away from us are the stars of the Big Dipper?
by Answerbag Staff on March 21st, 2010
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Why do you think ET aliens have such large eyes compared to humans?
by LEO on October 28th, 2011
| 6 people like this
Barf was half idiot and half dog. But how did Lonestar treat the poor animal?
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by einsteinwasright0116 on October 31st, 2011
| 1 person likes this
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