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  2. Action principles - Wikipedia

    en.wikipedia.org/wiki/Action_principles

    This approach to mechanics focuses on a single point in space and time, attempting to answer the question: "What happens next?". [3] Mechanics based on action principles begin with the concept of action, an energy tradeoff between kinetic energy and potential energy, defined by the physics of the problem. These approaches answer questions ...

  3. Isovist - Wikipedia

    en.wikipedia.org/wiki/Isovist

    The isovist is one of the two representations of the structure of space, along with the spatial-envelope representation. [1] It is an approach in describing space from the point of view of a person within an environment. [3]

  4. Space rendezvous - Wikipedia

    en.wikipedia.org/wiki/Space_rendezvous

    A space rendezvous (/ ˈ r ɒ n d eɪ v uː /) is a set of orbital maneuvers during which two spacecraft, one of which is often a space station, arrive at the same orbit and approach to a very close distance (e.g. within visual contact).

  5. Approach space - Wikipedia

    en.wikipedia.org/wiki/Approach_space

    An approach space is defined to be a pair (X, ... Then (P, e) is an approach space. Topologically, P is the one-point compactification of [0, ∞).

  6. Spherical coordinate system - Wikipedia

    en.wikipedia.org/wiki/Spherical_coordinate_system

    In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a given point in space is specified by three real numbers: the radial distance r along the radial line connecting the point to the fixed point of origin; the polar angle θ between the radial line and a given polar axis; [a ...

  7. Phase space - Wikipedia

    en.wikipedia.org/wiki/Phase_space

    The phase space of a physical system is the set of all possible physical states of the system when described by a given parameterization. Each possible state corresponds uniquely to a point in the phase space. For mechanical systems, the phase space usually consists of all possible values of the position and momentum parameters.

  8. Conformal cyclic cosmology - Wikipedia

    en.wikipedia.org/wiki/Conformal_cyclic_cosmology

    Conformal cyclic cosmology (CCC) is a cosmological model in the framework of general relativity and proposed by theoretical physicist Roger Penrose. [1] [2] [3] In CCC, the universe iterates through infinite cycles, with the future timelike infinity (i.e. the latest end of any possible timescale evaluated for any point in space) of each previous iteration being identified with the Big Bang ...

  9. Special relativity - Wikipedia

    en.wikipedia.org/wiki/Special_relativity

    In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time.In Albert Einstein's 1905 paper, On the Electrodynamics of Moving Bodies, the theory is presented as being based on just two postulates: [p 1] [1] [2]