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Is This the Ultimate Telescope?
During that period when the universe was opaque, there were pressure waves moving through it. Pressure makes matter move back and forth, which creates gravitational waves. So we need to have a gravitational wave observatory where the two ends of it are a million kilometers apart. Plans for lisa are under way. The other two, i mentioned, they're on like, the to do lists. And whether what order we get them is still yet to be determined.