This might seem easy, but to guess exactly what it is would be hard for most people. Give it a try before you read on.
Need a hint? Okay: It's a lot more down to Earth than you might think.
No more hints.
This is a photo of the exhaust plume billowing out from rockets launching a space shuttle. It's the shuttle Endeavour in a night launch Feb. 8, 2010.
On Monday (May 16) Endeavour is slated to launch at 8:56 a.m. ET for its last flight. [Update: Endeavour Launched.]
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