BLACK HOLES by Ted Bunn. What is a black hole?
--------------------- Loosely speaking, a black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. Since our best theory of gravity at the moment is Einstein's general theory of relativity, we have to delve into some results of this theory to understand black holes in detail, but let's start of slow, by thinking about gravity under fairly simple circumstances. Suppose that you are standing on the surface of a planet. Custom Tree House Plans, DIY Ideas & Building Designs. No, really: would you want to design, build and live in an real fantasy tree house all year round?
More and more people have decided to do just that and where treehouses were once novelty architecture for kids they are now (almost) mainstream structures, as attested to by the pictures above via Bella Seven. Many modern tree house designs and home designers and custom builders take a site-specific approach and construct their tree buildings around not only views and rooms but also have to account for access and structural support in unique and novel ways.