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  1. Dictionary
    observe
    /əbˈzəːv/

    verb

    More definitions, origin and scrabble points

  2. en.wikipedia.org › wiki › Hubble's_lawHubble's law - Wikipedia

    20 hours ago · D is the proper distance (which can change over time, unlike the comoving distance, which is constant) from the galaxy to the observer, measured in mega parsecs (Mpc), in the 3-space defined by given cosmological time. (Recession velocity is just v = dD/dt). Hubble's law is considered a fundamental relation between recessional velocity and ...

  3. 20 hours ago · t. e. 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 treatment, the theory is presented as being based on just two postulates: [p 1] [1] [2] The laws of physics are invariant (identical) in all inertial frames of ...

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