Sometime this year, an old Russian spacesuit — tossed overboard from the international space station this month — will make its final, fiery dive into the Earth's atmosphere. Within seconds, Suit-Sat — alias Ivan Ivanovich, alias NORAD Object No. 28933 — will be toast and the U.S. Space Surveillance Network will have one less piece of space junk to surveil. Ditto for Object No. 28934, aka Ivan's glove, which broke off when the suit was shoved out the station's air lock. At the moment, 9,233 pieces of space junk are being tracked in Earth orbit. But that tally only covers...