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  2. General relativity - Wikipedia

    en.wikipedia.org/wiki/General_relativity

    It is due to the influence of gravity on the geometry of space and to the contribution of self-energy to a body's gravity (encoded in the nonlinearity of Einstein's equations). [92] Relativistic precession has been observed for all planets that allow for accurate precession measurements (Mercury, Venus, and Earth), [ 93 ] as well as in binary ...

  3. Special relativity - Wikipedia

    en.wikipedia.org/wiki/Special_relativity

    During their journey, people on Earth will experience more time than they do – since their clocks (all physical phenomena) would really be ticking 3.1 times faster than those of the spaceship. A 5-year round trip for the traveller will take 6.5 Earth years and cover a distance of over 6 light-years.

  4. Tests of general relativity - Wikipedia

    en.wikipedia.org/wiki/Tests_of_general_relativity

    The mere curvature of the path of a photon passing near the Sun is too small to have an observable delaying effect (when the round-trip time is compared to the time taken if the photon had followed a straight path), but general relativity predicts a time delay that becomes progressively larger when the photon passes nearer to the Sun due to the ...

  5. Introduction to general relativity - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_general...

    Objects are falling to the floor because the room is aboard a rocket in space, which is accelerating at 9.81 m/s 2, the standard gravity on Earth, and is far from any source of gravity. The objects are being pulled towards the floor by the same "inertial force" that presses the driver of an accelerating car into the back of their seat.

  6. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    The surface of the earth is curved, which is why it is impossible to make a perfectly accurate flat map of the earth. Non-Cartesian coordinate systems illustrate this well; for example, in the spherical coordinates ( r , θ , φ ), the Euclidean distance can be written d s 2 = d r 2 + r 2 d θ 2 + r 2 sin 2 ⁡ θ d φ 2 {\displaystyle ds^{2 ...

  7. Hubble's law - Wikipedia

    en.wikipedia.org/wiki/Hubble's_law

    Baryon acoustic oscillations. An extended survey (eBOSS) began in 2014 and is expected to run through 2020. The extended survey is designed to explore the time when the universe was transitioning away from the deceleration effects of gravity from 3 to 8 billion years after the Big Bang. [123] 2016-05-17 73.24 ± 1.74: Hubble Space Telescope [124]

  8. History of gravitational theory - Wikipedia

    en.wikipedia.org/wiki/History_of_gravitational...

    The 12th-century scholar Al-Khazini suggested that the gravity an object contains varies depending on its distance from the centre of the universe (referring to the centre of the Earth). Al-Biruni and Al-Khazini studied the theory of the centre of gravity, and generalized and applied it to three-dimensional bodies.

  9. Timeline of gravitational physics and relativity - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_gravitational...

    [249] [250] LIGO-VIRGO and Fermi constrain the difference between the speed of gravity and the speed of light in vacuum to 10 −15. [251] This marks the first time electromagnetic and gravitational waves are detected from a single source, [252] [253] and give direct evidence that some (short) gamma-ray bursts are due to colliding neutron stars ...