When two spacecraft meet in outer space, the specific actions and interactions depend on the intent and circumstances of the encounter. There are various scenarios for spacecraft meetings:

1. Rendezvous and Docking: In planned missions, spacecraft are designed to rendezvous and dock in space. This often involves carefully coordinated maneuvers to bring two spacecraft together. Docking mechanisms, such as docking ports or docking collars, are used to physically connect the spacecraft. This can be for crew transfers, resupply missions, or the assembly of space stations.
2. Flyby or Close Approach: In some cases, spacecraft may come close to each other for scientific observations or reconnaissance. Flybys of other celestial bodies, like planets or moons, are examples of such missions. Precise navigation and communication are essential to ensure safe close approaches.
3. Space Debris Avoidance: Space agencies and organizations closely monitor space debris and defunct satellites. When a functioning spacecraft approaches space debris, adjustments may be made to change its orbit and avoid potential collisions. The International Space Station (ISS), for example, periodically performs orbital adjustments to avoid debris.
4. Unplanned Encounters: In rare cases, there may be unexpected encounters with space debris or defunct satellites that are no longer under control. In such instances, spacecraft may need to perform evasive maneuvers to prevent collisions.
5. Asteroid and Comet Missions: When spacecraft are sent on missions to study or interact with asteroids or comets, they may intentionally approach, land on, or collect samples from these celestial bodies.

In all these scenarios, spacecraft meet or approach each other with careful planning and coordination. Communication with mission control on Earth is vital for ensuring the safety and success of the encounter. Complex calculations, orbital mechanics, and precise navigation are involved in these operations to ensure that spacecraft meet, dock, or fly by each other without incident. It’s important to note that maintaining safety and avoiding collisions is a top priority in all space missions.