China's Tiangong-1 space station may fall from the sky on April 1.
That is not an April Fools' joke. It's a real possibility.
The European Space Agency has narrowed its window for re-entry of the long-abandoned orbiting lab — the current estimate is that it will plunge from orbit in a fiery ball of flame sometime between March 31 to April 2.
But that window is considered "highly variable" and no one is sure yet where exactly it will come down.
The 34-foot-long, 18,000 pound Tiangong-1, or "Heavenly Palace-1" was launched in 2011 as China's first attempt at an orbiting space lab. It was occupied by two separate crews of three astronauts, or taikonauts, each – a mission in June 2012 included China's first female astronaut, Liu Yang. A year later, another crew included the country's second woman in space, Wang Yaping.