A piece of the space shuttle Columbia has been discovered in an east Texas lake, report CNN and Space.com. The shuttle broke up when re-entering the atmosphere in 2003, killing its seven-person crew. The newly-discovered part is a tank 4 feet in diameter that contributed power and water to the shuttle, says a NASA rep. The part was discovered after a drought lowered the lake’s water level, said authorities from the city of Nacogdoches, where other material from the ship has been found. (More Columbia Space Shuttle stories.)