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2. Expansion of the universe - Wikipedia

   en.wikipedia.org/wiki/Expansion_of_the_universe

   Contrary to common misconception, it is equally valid to adopt a description in which space does not expand and objects simply move apart while under the influence of their mutual gravity. [2] [3] [4] Although cosmic expansion is often framed as a consequence of general relativity, it is also predicted by Newtonian gravity. [5] [6]

3. Alcubierre drive - Wikipedia

   en.wikipedia.org/wiki/Alcubierre_drive

   The Alcubierre drive ([alkuˈβjere]) is a speculative warp drive idea according to which a spacecraft could achieve apparent faster-than-light travel by contracting space in front of it and expanding space behind it, under the assumption that a configurable energy-density field lower than that of vacuum (that is, negative mass) could be created.

4. Accelerating expansion of the universe - Wikipedia

   en.wikipedia.org/wiki/Accelerating_expansion_of...

   For supernovae at redshift less than around 0.1, or light travel time less than 10 percent of the age of the universe, this gives a nearly linear distance–redshift relation due to Hubble's law. At larger distances, since the expansion rate of the universe has changed over time, the distance-redshift relation deviates from linearity, and this ...

5. Cosmic inflation - Wikipedia

   en.wikipedia.org/wiki/Cosmic_inflation

   The spatial slices are expanding very fast to cover huge volumes. Things are constantly moving beyond the cosmological horizon, which is a fixed distance away, and everything becomes homogeneous. As the inflationary field slowly relaxes to the vacuum, the cosmological constant goes to zero and space begins to expand normally.

6. Flatness problem - Wikipedia

   en.wikipedia.org/wiki/Flatness_problem

   The local geometry of the universe is determined by whether the relative density Ω is less than, equal to or greater than 1. From top to bottom: a spherical universe with greater than critical density (Ω>1, k>0); a hyperbolic, underdense universe (Ω<1, k<0); and a flat universe with exactly the critical density (Ω=1, k=0). The spacetime of ...

7. Ultimate fate of the universe - Wikipedia

   en.wikipedia.org/wiki/Ultimate_fate_of_the_universe

   If <, the geometry of space is open, i.e., negatively curved like the surface of a saddle. The angles of a triangle sum to less than 180 degrees, and lines that do not meet are never equidistant; they have a point of least distance and otherwise grow apart. The geometry of such a universe is hyperbolic. [11]