Space Explosions - 81 With Veneer 13

Veneer 11 and 12 included cloud droplet analyzers that allowed them to start to understand the chemical composition of the atmosphere. The more they studied, the more nastiness they found. And once they got there with veneer 13, they got there again with venee 14. This was a mission that then found this as a planet that while it doesn't have plate tectonics like Earth, it does have seismic activity.