As the astronaut approached the event horizon of the wormhole, they felt a mix of anticipation and dread. They had trained for this moment for years, but the theoretical science behind wormholes still made them uneasy. The astronaut felt a sudden jolt as they passed through the event horizon and into the mouth of the wormhole. For a moment, everything went black. Then, with a blinding flash of light, the astronaut emerged on the other side. They felt weightless, as if they were floating in a sea of stars. The universe around them was unrecognizable, with strange constellations and alien planets dotting the horizon. For a moment, the astronaut forgot about their mission and simply marveled at the wonders of the cosmos. Not only have they travelled somewhere else.  They have reached some when-else.