John Carlos Baez@phiofx - LIGO changed our views on astrophysics: it turns out there are lots of black holes 30-60 times the mass of our Sun, and we still don't where they came from. But not our views on gravity or cosmology. LISA, on the other hand, may measure the gravitational background radiation, which was produced about 10⁻³⁸ seconds after the Big Bang! This probes a realm we've never accessed before, and it could shed new light on quantum gravity.
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