But we won't detect them with LIGO. We will need a lower-frequency detector, like the space-based LISA design, to do that. It's just like how we have optical t

But we won't detect them with LIGO. We will need a lower-frequency detector, like the space-based LISA design, to do that. It's just like how we have optical telescopes for visible light and radio telescopes for light at different frequencies. Different interferometer designs will pick up different phenomena based on what their sensitive band is.