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The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it.
In 2012, Teitel created the YouTube channel, The Vintage Space, [13] in which she delves into the early history of space flight. Teitel was a co-host for the Discovery Channel's online DNews channel, which later became Seeker. [14] She has also appeared on Ancient Aliens, NASA's Unexplained Files, and other cable documentary shows. [15]
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, the Big Rip is a hypothetical cosmological model concerning the ultimate fate of the universe, in which the matter of the universe, from stars and galaxies to atoms and subatomic particles, and even spacetime itself, is progressively torn apart by the expansion of the universe at a certain time in the future, until distances between particles will infinitely increase.
[7] [obsolete source] In this case, the universe did not collapse into a black hole, because currently-known calculations and density limits for gravitational collapse are usually based upon objects of relatively constant size, such as stars, and do not necessarily apply in the same way to rapidly expanding space such as the Big Bang.
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A look at the prospects for the commercialization space, from $20 million vacation trips to the ISS, the possibility of orbital hotels, and spaceplane flights 120 miles above the Earth are just the beginning. Also a look at the hazards, such as cosmic radiation and space debris, that could spell disaster for these outerspace endeavors.
562,474,029 [1] (January 11, 2025) NASASpaceflight , often referred to as NSF , is a private aerospace news organization, which operates a YouTube channel, website, and forum, which launched in 2005, as well as various social media channels covering crewed and uncrewed spaceflight and aerospace engineering news.