What is a Gravitational Wave ?
 
 
- Very small deformations of space time
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- Amplitude h = DL/L < 10-21 (1 = flat space)
 
- Travelling (waves) at the speed of light 
- Generated by cosmic events : 
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- Supernovae, Coalescing binary neutron stars, Formation of black holes... 
 
- Gives new insights in fundamental Physics and Astrophysics