Being quarantined has me thinking of a story where John and Rodney go missing on an alien planet for several years. I believe that they were testing a new plane/engine/tech but it failed and they exited subspace a gazillion light years from where they were supposed to be. Theymanaged to find a planet that was somewhat habitable for humans. The planet was very alien, had unknown wildlife and plantlife that wrecked havoc on their bodies. They used the sun to recharge the jumper (?) so that they could get offworld/gate out. I think John broke his leg and they both ate stuff that made them very ill.
When they left earth on their mission John was involved with another man and Jennifer and Rodney were a couple. When John and Rodney returned to earth their respective partners had both moved on, although I think Jennifer and Rodney were still married (to keep his research safe, or something). Jennifer was pregnant with another man, I believe. John and Rodney never cheated while off world, but I believe they became a couple after they returned.
Can anyone help me?