Light isn't some speed limit. There isn't a space cop telling you that you can't go faster. It's that, no matter how fast you travel, light will always seem to travel at the same speed, relative to you. It's space and time that bend around you as you approach the speed of light. So, if you go .9999c, you can reach places in a matter of weeks that are many light years away. But to those watching you back home, it will still appear to take you that many years to get there.
28 â¢ ArcGIS Hydro Data Model Virtual Catchments (Colored Areas) â Defined with the CostAllocation Function Hydro Response Units A Hydro Response Unit is an area of the land surface that has homogeneous precipitation and/or land surface characteristics.
In human geography, a catchment area is the area from which a city, service or institution attracts a population that use their services. For example, a school catchment area is the geographic area from which students are eligible to attend a local school. Supermarkets, on the other hand, have a much lower density, with catchment areas of several neighborhoods (or several villages in rural areas). 2  This principle, similar to the central place theory, makes catchment areas an important area of study for geographers, economists, and urban planners.