What type of tide has the highest amplitude

Spring tides
The most extreme tidal range occurs during spring tides, when the gravitational forces of both the Moon and Sun are aligned (syzygy), reinforcing each other in the same direction (new moon) or in opposite directions (full moon).

They go to discover new things about our Earth and the universe. they look for ways to travel to other planets and document movements. they go to fix the space station sometimes and also to run trials. they do different experiments and collect samples from the moon to see if they can discover life on other planets.