Why a Black Hole Probably Isn't a Shortcut?

Could anything fall into a black hole and come out somewhere else, the way Star Trek's V'Ger story assumes? I checked the maths against my sources. I use a real black hole, Gaia BH1 (9.62 Suns, a horizon about 57 km across, assuming it does not spin), and ask three things: does the "bridge" of Einstein and Rosen stay open long enough to cross, does a black hole made by a star have another side at all, and where does a fall inside a black hole end? The spinning case is still open, and I mark what is expected and not proven. Chapters: 0:00 Did V'Ger fall through a door? 0:41 A real black hole: Gaia BH1 1:14 Where the idea of a door comes from 2:22 Can light cross the bridge? 3:21 Does a real star leave another side? 4:12 What is inside a black hole that does not spin? 4:47 How long is the fall? 6:13 What a watcher far away sees 6:38 Sagan, Thorne and the wormhole that needs negative energy 7:22 So, is it a door? If you find a wrong number, date or unit, or something I missed, tell me in the comments. I will fix it here and note the correction above. ------ Credits: Clips of Star Trek: The Motion Picture (c) Paramount Pictures, used for commentary. Milky Way star map: NASA/Goddard Space Flight Center Scientific Visualization Studio (SVS 4851); Gaia DR2: ESA/Gaia/DPAC. Paris at night: NASA Earth Observatory/NOAA NGDC (Suomi NPP VIIRS, Black Marble 2012). Voyager 3D model: NASA. Voyager 1 launch, 1977: Courtesy NASA/JPL-Caltech/KSC. First image of M87*: EHT Collaboration, CC BY 4.0 (via ESO, eso1907a). First image of Sagittarius A*: EHT Collaboration, CC BY 4.0 (via ESO, eso2208). Karl Schwarzschild, 1916 paper (public domain); portrait: AIP Emilio Segre Visual Archives. Albert Einstein, 1921: photo by Ferdinand Schmutzer (public domain). London Marathon runners, 2008: Marek Slusarczyk (Tupungato), CC BY 3.0. John A. Wheeler, 1985: Emielke, CC BY-SA 3.0. Carl Sagan with Mariner 9 photos of Mars: Courtesy NASA/JPL-Caltech. Kip Thorne, 2017: Bengt Nyman, CC BY 2.0. Papers shown on screen: Dafermos and Luk (arXiv:1710.01722); Lewis and Kwan (arXiv:0705.1029). ------- #BlackHole #Wormhole #Physics #Astronomy #StarTrek