Hubble - Deep Space Probe

In 1994 Astronomers decided to point the Hubble Telescope at a dark spot out in space and they left it there for 10 days.

 The results encouraged them to try again for 11 days in 2004.
Turn up your sound while you look at the 3-D presentation the astronomers made
It's almost (?) more than we can comprehend

There are several other links on the that page on the same subject

The Hubble telescope

Want an estimate ?
There are 100,000,000,000 galaxies each containing 100,000,000,000 Stars (suns with planets)
Remember, it is only an estimate (albeit an educated one, made be astronomers)