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SCIENCE GRAVITY
RTRQ2H 
January 09, 2002 
Concrete and stainless steel tubes house and protect the four-kilometer
long laser apparatuses at the... 
Hanford, United States of America 
CONCRETE TUBES PROTECT RESEARCH LASERS AT LIGO HANFORD RESEARCH
FACILITY. 
Concrete and stainless steel tubes house and protect the four-kilometer
long laser apparatuses at the LIGO Hanford Observatory in Hanford,
Washington, January 9, 2002. LIGO, which stands for Laser
Interferometer Gravitational-Wave Observatory, has the mission to
observe gravitational waves of cosmic origin, including those created
by black holes, star collisions and remnants of gravitational radiation
created by the "big-bang" birth of the universe. The LIGO Hanford
facility houses laser interferometers consisting of mirrors suspended
at each of the corners of a gigantic L-shaped vaccum system measuring
four kilometers on each side. LIGO Hanford is part of a $370 National
Science Foundation project focused at researching these gravitational
waves. REUTERS/Anthony P. Bolante/FEATURE-SCIENCE-GRAVITY

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