A small, experimental satellite launched in failure in 1974 and lost to ground-based sensors for a quarter century has suddenly reappeared. On April 10, 1974, the large reconnaissance satellite KH-9 Hexagon ejected a much smaller,

In a case of cosmic missing keys, scientists misplaced a satellite known as S73-7 for over two decades. Missing since the 1990s, the satellite mysteriously resurfaced recently, prompting questions about how the Department of Defense managed to lose track of an interstellar probe in the first place.