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.
However, there are fears over the effect of earth of an impact on the Moon by a 2015 TB145-sized object. Fragments of the huge asteroid and the Moon itself could potentially hurtle into our atmosphere, showering us with meteorites of unknown sizes, according to some sky gazers.In the unlikely event of it affecting the Moon's orbit, there could be an effect on tide levels on our oceans.n asteroid of just 30 metres could destroy a large city. If Spooky were to impact us or the Moon, the energy released would be measured not in kilotons like the atomic bombs that ended the Second World War, but in H-Bomb type megatons.