how many galaxies are there??

Question: how many galaxies are there??
- Keywords:
  galaxy,
  space
Asked by hannah5959 to James, Marcus, Martin, Rob, Suzanne on 16 Mar 2012.
- James Boone answered on 15 Mar 2012:
  
  There are Millions and millions of galaxies. I don’t think anyone has an exact answer to that question.
- Marcus Gallagher-Jones answered on 16 Mar 2012:
  
  Far too many to count easily. I’m sure a formula has been laid out to have a (very good) guess but I doubt we can know for sure.
- Martin Zaltz Austwick answered on 16 Mar 2012:
  
  And each of those galaxies has hundreds of billions of stars. If just some of those stars have planets, how many other places like earth are there out there? And how many places with other living creatures?
- Suzanne McEndoo answered on 18 Mar 2012:
  
  I don’t know myself, so I asked Dr Google. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/021127a.html
  
  “For example, in 1999 the Hubble Space Telescope estimated that there were 125 billion galaxies in the universe, and recently with the new camera HST has observed 3,000 visible galaxies, which is twice as much as they observed before with the old camera. We’re emphasizing “visible” because observations with radio telescopes, infrared cameras, x-ray cameras, etc. would detect other galaxies that are not detected by Hubble.”

Question: how many galaxies are there??