Can you imagine a large metal balls to drop from the space? Sounds like a movie but it actually happened in Namibia, when a metal round object fell from the sky. According to the sources on the internet, Namibian authorities contacted NASA to investigate and today, two month after studying the mysterious object the result is clear – it is a metal, well known to men. 
As many web pages reported several balls already dropped earlier to the Earth in southern Africa, Australia and Latin America in the past 20 years.
This orb is not really a mystery, because it started to be normal to have some metal object, including balls falling from the sky (or better to tell from the space). According to the tech blog Gizmodo it is jus one of the objects (one of the let’s say 22 000) nowadays are floating in space.
By the estimations made by NASA, there coud be from hundreds to even millions smaller or bigger objects in space. So if you see that something is falling from the space, don’t panic, it’s probably some trash from space programs.
This fall two satellites “came back” to Earth and it is expected that during the January one of the Russians satellites Phobos Grunt Mars probe will plunge to the Planet.
We are lucky that there is a lot of empty unpopulated land here on Earth, and that fact is in our favor. Even if it doesn’t hit an empty parts of the land it is the most probably that will hit an Ocean. The calculation of the chances that that kind of object will hit a man say that chans is about 1:3,200.
And don’t vary, if you see a mysterious metal object, it’s probably made by us.
Texas Meteor Fireball