Short Story
Letters of Transit
- by Brian Plante
- in Analog, April 2005
A scientist on the first near-lightspeed ship to Centauri A exchanges letters with his underage girlfriend back on Earth through a wormhole for which time passes at the same rate on both ends. When the ship returns to Earth with its end of the wormhole, the hole will act as a time machine for messages, but the clichéd paradox police won’t let scientist send girlfriend any information about the future.
You wouldn’t want to cause any of those nasty paradoxes, would you?