1 Drainage basin-the area of land drained by a river. 2  Catchment area-the area within the drainage basin. 3  Watershed-the edge of highland surrounding a drainage basin.4  It marks the boundary between two drainage basins. 5  Source-The beginning or start of a river. 6  Confluence-the point at which two rivers or streams join. Watershed-the edge of highland surrounding a drainage basin. 2  It marks the boundary between two drainage basins. 3  Source-The beginning or start of a river. 4  Confluence-the point at which two rivers or streams join.
Dangerous levels of radiation in space could bar astronauts from a mission to Mars and limit prolonged activity on the moon, experts now caution.However, more research could reveal ways to handle the risks that radiation poses to space missions.The magnetic field of Earth protects humanity from radiation in space that can damage or kill cells. Once beyond this shield, people become far more vulnerable.owever, more research could reveal ways to handle the risks that radiation poses to space missions. The magnetic field of Earth protects humanity from radiation in space that can damage or kill cells. Once beyond this shield, people become far more vulnerable.
During the Apollo program, the United States sent 9 manned missions to the Moon. These nine missions included 24 men. Of these 24 men, 12 actually walked on the surface of moon. The other 12 astronauts have been to lunar orbit and back, but did not land on the surface.This included Apollo 8, Apollo 10, and the ill-fated Apollo 13, as well as the 6 Command Module pilots for the six landing missions.The 9 missions to the moon:hese nine missions included 24 men. Of these 24 men, 12 actually walked on the surface of moon. The other 12 astronauts have been to lunar orbit and back, but did not land on the surface.