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" ... Maybe there are some other weakly interacting particles that could be detected from earlier than the CMB, says Filippenko. The very early universe was opaque to light, but not to neutrinos —- nearly massless, highly noninteracting particles that should have been produced with great abundance early in the Universe's history. There also may be other weakly interacting particles, not to primordial gravitational waves, (ripples in the fabric of spacetime) formed by fluctuations in energy shortly after creation, he says. ... "