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Here's a wikipedia article explaining it.

http://en.wikipedia.org/wiki/Geostationary_balloon_satellite

These balloons will not be geostationary.

At least read the link that was posted? Because otherwise, you miss parts like this from the linked article:

"This is the ideal height because Air density is 1/10th of what it is at Sea level. This makes the wind at these altitudes 10 times less potent."

No, independent of whether it's possible to make a geostationary balloon, Google's balloons are not going to be stationary. They are steered purely by changing altitude and riding high-altitude winds.

Sure, except, the context of this sub-thread was started by someone claiming that winds in the upper atmosphere "can be very fast." So the link was to correct/explain to them, not to claim that the Google Balloons would be stationary.

Stratospheric wind speeds are very fast. Look it up if you don't believe me. I was just basing this from a quote in the original article "wind speeds as high as 291 km/h".

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