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a wormhole is like a portal that has 2 ends, a black hole and a white hole, a black hole attracts things & the things go on the "bridge" and fly out of the white hole. but wormholes may not even exist because neutron stars can look like wormhole entrances. a white hole has negative-gravity. everything has a swartzchild's radius which is a radius that light can't escape from. Wormholes may not even exist because the dark thing may be a neutron star that light doesn't escape. as something enters a wormhole, it streaches as it closes into the wormhole this is called "spaghettification", as soon as anything crosses the swartzchild's radius of a wormhole it can't escape, not even light. the white hole has a swartzchild's radius that nothing can enter, not even light. it is hard to know what is in a wormhole but there are many theories about wormholes. most wormholes form when large suns collapse beyond neutron star and into a singularity which breaks throu space-time into an unknown location, possibly in another galaxy! but things probably get wierd when a wormhole spins. the spinning wormhole(the black hole at least) will now not have 1 event horizon(swartzchild's radius) but 3, the singularity will become a ring(shape, not the rock that floats in space). as something falls into a wormhole, it "red-shifts" meaning it turns more and more red and it will get so red that you will not see this object. by the time it reaches the event horizon, the light from this object will not move because gravity is accelerating at lightspeed and the light is stationary. this object will be invisible, no matter which spectrum you can see.
^ this is what the entrance of a wormhole(black hole) will look like.
relativity suggests that as you see something fall into a wormhole, it's clock will seem to slow down and get more red untill it disapears from view. so you can't see anything enter a wormhole. also, time and space(Dementions x, y, & z) switch inside a wormhole! imagine if there was a LED that emits light in all direction, and then plot it on a time line, the circle of light will grow at light-speed(c) and it will be shaped like a cone known as a "light cone"(not the type in eyes) and you can only move around inside this "light cone", you can't explore outside this light cone. but in 3D space, this "cone" is just a growing sphere. but near a wormhole, a light cone will scew toward the wormhole(if you are near the entrance(black hole) instead of the exit(white hole)) but inside the so-called "event horizon", the light cone curves only inside the event horizon meaning you can not explore outside of the wormhole entrance but your only choices to move will make you end up in the exit(white hole). relativity also says that anything warps the space-time, making a gravitational tug. a singularaty will warp space time and space-time gets steeper the closer you get and the more gravity an object has, the more it makes space-time steeper. if you were the object that fall into a wormhole with a clock, your clock will run the same speed but the entire rest of the galaxy'll seem to speed up. in order to understand the wildness of a wormhole, we'll need a space-time diagram where the x-axis is the distance from the center of the wormhole and the y axis is "schwarzschild" time. the dotted line is the start of the event horizon. v
and the same chart but with curving light-cone. --------------------------->
in this space-time diagram, the light rays swoop upward near the edges of the event horizon. the yellow gradient things are the light-cones and in the event horizon, the light-cones point into the singularaty. the rays swoop up, but they never reach the edge. light being emited inside the wormhole will come into the singularity and go out the white hole. this is a 2-D map of a wormhole of 4-D space just like the Mercator's map. if you do a different coordinate system, the yellow lines travel to the white hole & the orange lines swoop towards the event horizon but doesn't reach. in this map, things can cross throu the event horizon and their destiny will be at the white hole.--> if this map were transformed so that every light cone will be 90° wide, something fascinating happenes, the singularity becomes a curve at the top and the map seems pops into 3-D but it is still 2-D. the future always points up. the event horizon is not just a place in space, but a moment in time, too. this map is called Kruskal-Szekeres's map. then, compressing the infinite past and future, like using the galaxy's fisheye lens and this will give you the map below...
...the purple square is the entire galaxy and what i mean by "galaxy", i mean a galaxy that contains unlimited galaxies under influence of 1 "god" known as a "universe". and the pink triangle is the wormhole. light cones will still & always be 90° pointing up. the top corner of the purple square is the infinite future and the bottom corner is the infinite past, the middle corners are the infinite distance. if you are in the universe, then you can move into the wormhole or explore more of space. if you are in the wormhole, then you can't get out, but what is on the left side of the pink triangle may be another universe, so objects from both universes can end up in the same black hole. below, left of the purple square(universe) may be the exit of another wormhole, which can send information into the universe or black hole but the universe can't send info to the white hole. ----------------------------------------------------------------------------->
stack these maps up and you have a wormhole map of the so-called "Multyverse". each universe having a universe parallel to it and every next pair of universes will be so-called "antiverses" which are universes with negative gravitational tug which will be wierd. but this is just a theory, it will not be true if wormholes were actually neutron and quark stars.
temperature: NaN
Gravity: any
life span: depends
past type: suns, light, mass that was then compressed
future type: void(not the kind that is outside of the galaxy)
Types:
nano-wormhole
stellar wormhole
intermediate wormhole
supermassive wormhole
hypermassive wormhole
grey hole