pestora and heye were brawl ing during a conference in munich, heye was on hand, pistora had alreadyis ponennent during the prefight. bill: there was no chance that was planned, was it? >> julie: i don't know, bill, you might be on to something! bill: even if areas as emas space can get dirty, from dead satellite toss rocket parts, there is literally tons of space junk floating around earth's orbit. here's what that looks like. one solution in the works, a deep space vacuum cleaner to sweep up the entire mess. the author of physics of the future, which hits stores in paper back today, michio kaku is with me in the studio. good morning to you! you say it's about time. >> yes. there's 20,000 pieces of debris -- debris, larger than 4 inches, all the way up to the size of a greyhound bus, it's an accident wait to go happen. bill: so the idea comes out of switzerland and it's called clean space one. what is that. >> it's a gigantic object with a claw that grabs a small sab light, the swiss have satellites this size by the way, and plunges them into the earth, burning up. at $10 million, s