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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]
Thus, an accelerating universe took a longer time to expand from 2/3 to 1 times its present size, compared to a non-accelerating universe with constant ˙ and the same present-day value of the Hubble constant. This results in a larger light-travel time, larger distance and fainter supernovae, which corresponds to the actual observations.
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the very early universe.Following the inflationary period, the universe continued to expand, but at a slower rate.
Such recession speeds do not correspond to faster-than-light travel. Many popular accounts attribute the cosmological redshift to the expansion of space. This can be misleading because the expansion of space is only a coordinate choice. The most natural interpretation of the cosmological redshift is that it is a Doppler shift. [96]
India's space agency is attempting to land a spacecraft on the moon's south pole, a mission that could advance India's space ambitions and expand knowledge of lunar water ice, potentially one of ...
The mathematical derivation of an idealized Hubble's law for a uniformly expanding universe is a fairly elementary theorem of geometry in 3-dimensional Cartesian/Newtonian coordinate space, which, considered as a metric space, is entirely homogeneous and isotropic (properties do not vary with location or direction). Simply stated, the theorem ...
NASA’s Space Launch System (SLS) rocket, with the Orion capsule atop, launches the Artemis I mission from NASA's Kennedy Space Center on November 16, 2022. - Kevin Dietsch/Getty Images
“Today’s success represents a giant leap forward for the commercial space industry and @NASA’s long-term goal to build a vibrant U.S. space economy.” The four citizen astronauts will have ...