iReporter: How realistic are any of these telescopes? Are they just like thought experiments, or actually in the plans for lisa. Lisa would be really great at hearing primordial gravitational waves, but it would just be blind to some other things, like starlight. i got this fascinating answer from catelan casey,. She's the u t austin astronomer who wants to look for the first light of the universe. And whether what order we get them a is still yet to be determined.