Space exploration has to do with many encounters as well. Some encounters are the US encountering with other countries exploring space. Also space exploration has had encounters with some difficulties while on expeditions. A well known one is Apollo 13. During Apollo 13 an explosion in one of the oxygen tanks crippled the spacecraft during flight and the crew were forced to orbit the Moon and return to the Earth without landing. We can learn from this encounter that space exploration is a very serious thing and can be dangerous if not handled properly. But an event more recently we have discovered water on Planet Mars.