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2. Fractional Orbital Bombardment System - Wikipedia

   en.wikipedia.org/wiki/Fractional_Orbital...

   Unlike the Outer Space Treaty, the SALT II agreement of 1979 explicitly prohibited the pursuance and deployment of the FOBS: [34] [35] Each Party undertakes not to develop, test, or deploy: (c) systems for placing into Earth orbit nuclear weapons or any other kind of weapons of mass destruction , including fractional orbital missiles;

3. Four-dimensional space - Wikipedia

   en.wikipedia.org/wiki/Four-dimensional_space

   Vectors. Mathematically, a four-dimensional space is a space that needs four parameters to specify a point in it. For example, a general point might have position vector a, equal to. This can be written in terms of the four standard basis vectors (e1, e2, e3, e4), given by. so the general vector a is.

4. Outer space - Wikipedia

   en.wikipedia.org/wiki/Outer_space

   Outer space. Being essentially empty, outer space allows the earliest (redder) galaxies to be viewed without obstruction, as in the Webb's First Deep Field image. Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies. [1] It contains ultra-low levels of particle densities, constituting a ...

5. Outer space (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Outer_space_(mathematics)

   Outer space (mathematics) In the mathematical subject of geometric group theory, the Culler–Vogtmann Outer space or just Outer space of a free group Fn is a topological space consisting of the so-called "marked metric graph structures" of volume 1 on Fn. The Outer space, denoted Xn or CVn, comes equipped with a natural action of the group of ...

6. Out (Fn) - Wikipedia

   en.wikipedia.org/wiki/Out(Fn)

   The operation of Out ( Fn) on the outer space is defined as follows. Every automorphism g of induces a self homotopy equivalence g′ of the bouquet of n circles. Composing f with g′ gives the desired action. And in the other model it is just application of g and making the resulting word cyclically reduced.

7. Oort cloud - Wikipedia

   en.wikipedia.org/wiki/Oort_cloud

   The outer Oort cloud may have trillions of objects larger than 1 km (0.6 mi), [4] and billions with diameters of 20-kilometre (12 mi). This corresponds to an absolute magnitude of more than 11. [20] On this analysis, "neighboring" objects in the outer cloud are separated by a significant fraction of 1 AU, tens of millions of kilometres.