1. Observing Gravitational Waves(GW) by LIGO
by Park young-ho

2. Mass with acceleration
Emit gravitational wave & loss energy
Types of GW
Continuous GW
Compact binary inspiral GW
Stochastic GW
Burst GW

3. catastrophic events Sloshing of space-time
Deformation of length at Earth
Measuring fine change of length
LIGO: Laser Interferometer Gravitational-Wave Observatory

4. Echo of light Echo of sound AFM: atomic force microscopy

5. Measuring Interference of light
Measuring Interference of light

6. Michelson Interferometer ≈ LIGO

7. Passive Damping: holds mirrors through a “quad”
Seismic Isolation
Active damping: sensing ground movements and performing counter movements 
Passive Damping: holds mirrors through a “quad”

8. Understanding cosmology, uranology and astronomy
Observing GW
GW telescope
Signal: Intensity, Direction, and shape !!!
Deducing and Interpret events in universe!