com/browse/m…http://dictionary.reference.com/browse/m…http://dictionary.reference.com/browse/b…http://spaceweather.com/For some one who CLAIMS that English is not his native language,......
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For some one who CLAIMS that English is not his native language, your spelling and grammar are excellent. They are too good. So good that your claim is obviously a lie.
The description sounds like a meteor (falling star, shooting star). I've never heard them described as "balls" though, but rather 'streaks' of light. They are the result of small pieces of debris in space that burn up when they enter Earth's atmosphere. It could have been a Draconid, a semi-major meteor shower that peaks this week.
Meteor velocities vary a great deal, beacuse of the speed and angle of the debris as it enters Earth's atmosphere. Most can move anywhere from 20km/s to 80km/s during their demise.
If I understand what you are asking, typically we call that a "shooting star". It typically burns up in the atomsphere and rarely hits the earth.
