Lead scientist David Jewitt, from the University of California at Los Angeles, said: "the truth is we're still struggling to understand what this means."

洛杉矶加利福尼亚大学首席科学家戴维·朱维特说：“事实上，我们还在努力理解这意味着什么。”

youdao

Insurance broker Nick Jewitt said statistics showed younger drivers had more accidents and so had to pay more.

BBC: Middle Rasen teenager struggles to get HGV insurance

The Kuiper-belt bodies Dr Jewitt and Dr Luu have found range from 100km (60 miles) to 500km across.

ECONOMIST: Unbuckling the Kuiper belt

"In random capture, we'd expect a 50:50 split - so we'll be thinking about why the retros are favoured in some way, " says Dr Jewitt.

BBC: More moons for Jupiter