# How much more precise would LIGO have to be?

The planets and a spinning black hole both drag their local frames and thus generate gravitational waves The amplitude should be proportional to the size of the celestial body, while the frequency of those waves should be related to how fast the object is spinning.

Let say I wanted to hear our planets gravitational "song". How precise would. LIGO have to be to measure the gravitational waves of the earth so they could be converted to an audible form?

• According to this answer, Earth's revolution around the Sun emits around 196 watts in gravitational waves. We won't be able to build a detector (in space) that could detect that radiation anytime soon. ;) Commented Apr 10, 2019 at 12:06
• Rotating objects symmetric about their rotation axes do not emit gravitational waves. This pushes the power of the emitted gravitational waves in the cases you consider to absolutely negligible numbers.
– Void
Commented Apr 10, 2019 at 16:23
• But the earth is not symmetric. Even if it was wouldn't have to emit some sort of gravitational wave as a result of frame dragging. Commented Apr 11, 2019 at 2:15

It depends what you mean by "gravitational emanations". There is a significant amount of "gravity gradient noise" at low frequencies ($$<20$$ Hz) caused by the test masses being pulled back and forth by changes in gravitational field associated with seismic motions of the ground around the detector. This noise is similar in magnitude (at low frequencies) to the seismic noise itself (once it has been damped by the test mass suspension and quadruple pendulum arrangement). Arguably therefore, this has been "detected" already.