Science News: A tiny asteroid no wider than a football pitch has been quietly puzzling astronomers for years, and a Chinese spacecraft is now closing in on the answ. A tiny asteroid no wider than a football pitch has been quietly puzzling astronomers for years, and a Chinese spacecraft is now closing in on the answer. The asteroid, called Kamo'oalewa, is one of only a handful of objects known as Earth's quasi moo... [4525 chars]