"My best guess: a small bit of aluminium rocket casing, causing an extremely
bright blue-green light as it burned (out)."
He said the metal was unlikely to have made a sound entering the atmosphere
30km above Earth.

With tens of thousands of pieces of discarded shuttle materials congesting
earth's atmosphere such sightings were becoming more frequent, Mr Ford said.

"What many people believe to be shooting stars are actually stray nuts and
bolts burning up on re-entry," he said."



http://news.ninemsn.com.au/article.aspx?id=15334