Space Shuttle Tests: Whole Lotta Quaking

The 1,000th shuttle engine test at Stennis Space Center in Bay St. Louis, Miss., took place Aug. 17, i i

The 1,000th shuttle engine test at Stennis Space Center in Bay St. Louis, Miss., took place Aug. 17, 2006. NASA hide caption

itoggle caption NASA
The 1,000th shuttle engine test at Stennis Space Center in Bay St. Louis, Miss., took place Aug. 17,

The 1,000th shuttle engine test at Stennis Space Center in Bay St. Louis, Miss., took place Aug. 17, 2006.

NASA

When space shuttle rocket engines are tested a mile from listener Stephan Howden's office in Mississippi, strangers think it's an earthquake. Howden says it's like a train going nearby.

We hear that sound, and then Robert Siegel talks to NASA Deputy Director David Throckmorton about why NASA tests its rockets so often.

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