The first probes outside the solar system crashed into a barrier. So did every probe after that. In every direction, a barrier enveloped our solar system.
People were sent to the barrier, to see, to touch, and to report back.
We touched the limit of our universe and it was smooth as glass. Clusters of galaxies chipped away under our gloves like old paint. Beneath that was a darkness complete it was difficult to look at.
I knocked on the roof of the universe and a great vibration rumbled under my gloves.
Then the lid of the universe opened up.