2 added 16 characters in body edited Feb 29 '16 at 8:00 user36790 With Gravitational Waves(GW) one can "know" that the Objects is there - detect it without "seeing"-visually, it just because the object has a mass. Anything moving and having a mass is emitting GW - current detectors are sensitive only for objects with masses equal to mass of many Suns 2x10^30 kg$$2\times 10^{30} ~\rm{kg}$$ (2 with 30 zeros). Imagine one day may we have sensors-detectors able to detect movement of any objects with mass without seeing it .... With Gravitational Waves(GW) one can "know" that the Objects is there - detect it without "seeing"-visually, it just because the object has a mass. Anything moving and having a mass is emitting GW - current detectors are sensitive only for objects with masses equal to mass of many Suns 2x10^30 kg (2 with 30 zeros). Imagine one day may we have sensors-detectors able to detect movement of any objects with mass without seeing it .... With Gravitational Waves(GW) one can "know" that the Objects is there - detect it without "seeing"-visually, it just because the object has a mass. Anything moving and having a mass is emitting GW - current detectors are sensitive only for objects with masses equal to mass of many Suns $$2\times 10^{30} ~\rm{kg}$$ (2 with 30 zeros). Imagine one day may we have sensors-detectors able to detect movement of any objects with mass without seeing it .... 1 answered Feb 12 '16 at 9:32 voter 17922 bronze badges With Gravitational Waves(GW) one can "know" that the Objects is there - detect it without "seeing"-visually, it just because the object has a mass. Anything moving and having a mass is emitting GW - current detectors are sensitive only for objects with masses equal to mass of many Suns 2x10^30 kg (2 with 30 zeros). Imagine one day may we have sensors-detectors able to detect movement of any objects with mass without seeing it ....