Answer:
There might as well be! There are so many stories about aliens and U.F.O's people from NASA are trying to find answers. "The ultimate goal of NASA's exoplanet program is to find unmistakable signs of current life on a planet beyond Earth. How soon that can happen depends on two unknowns: the prevalence of life in the galaxy and how lucky we get as we take those first, tentative, exploratory steps."
Explanation:
hope this helps you!
I believe the answer is: <span>wedge-sector model
</span>wedge-sector model is a theory of land use that focus on outward expansion from the center of urban area.
The positive trait of this model is that it consider the potential growth after the center urban area has been fully developed.<span />
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