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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.
Curved space often refers to a spatial geometry which is not "flat", where a flat space has zero curvature, as described by Euclidean geometry. [1] Curved spaces can generally be described by Riemannian geometry , though some simple cases can be described in other ways.
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.
A rotating wheel space station, also known as a von Braun wheel, is a concept for a hypothetical wheel-shaped space station. Originally proposed by Herman Potočnik in 1929, [ 1 ] and popularized by Wernher von Braun in 1952.
PBS Digital Studios was founded by Jason Seiken in June 2012. [1] They had their first viral hit with a "remix" of autotuned vocals from Mr. Rogers' Neighborhood titled "Garden of Your Mind." [2] The PBS Digital Studios network has received more than 500 million views and has over 7 million subscribers.