1. Previous measurements by spacecrafts to visit the moon indicated that water ice might exist in darkened areas of the crater.
2. The second step is to make technology breakthrough in extravehicular activities as well as space rendezvous and docking of spacecrafts.
3. Plutonium fuel has been used on two other spacecrafts taking off from the Cape Canaveral area since Cassini's launch.
4. NASA believed that the risk caused by the collision to other spacecrafts is low.
5. It then launched three more " Shenzhou " unmanned experimental spacecrafts not long afterwards.
6. The post office's establishment comes as China's two spacecrafts accomplished the country's first space docking procedure on the same day.