A large metal ball that fell from space into the Namibian grasslands last month is not alien, officials say, but that's about all they know for certain about the object.

According to a report on The Namibian website, the 13-pound metal sphere with two bumps on its poles was found by a farmer near Onamatunga in the Omunsati region between November 15 and November 20. Explosions were heard in the area before the discovery, but no evidence of an explosion was seen around the area where the object was found.

Paul Ludik, director of the country's National Forensic Science Institute, told The Namibian the sphere, with a circumference of 3.6 feet, is made of a "sophisticated" metal alloy that is known to man, but he said it has no markings that would identify it. No international space agency has claimed ownership, he said.

“A number of tests have been performed on the object, and it appears to be hollow. We are still busy with a detailed examination of the object,” The Namibian quotes him as saying.

Ludik told The Namibian that the object poses no cause for alarm, and that such reports of metallic spheres falling from space are common in the Southern Hemisphere.

So should we expect a run on helmets at sporting goods stores south of the equator?