A black hole is an object with such a powerful gravitational field that nothing, not even light, can escape it if it strays within a boundary known as the event horizon. Einstein's theory of general relativity says black holes should form whenever matter is squeezed into a small enough space.
Though black holes are not seen directly, astronomers have identified many objects that appear to be black holes based on observations of how matter swirls around them.
Wormholes are warps in the fabric of space-time that connect one place to another. If you imagine the universe as a two-dimensional sheet, you can picture a wormhole as a "throat" connecting our sheet to another one. In this scenario, the other sheet could be a universe of its own, with its own stars, galaxies and planets.
It is beyond our contemporary scientific realm finding concrete information from either black holes and wormholes, since that would require "direct plunge" in these unimaginably "twisted" and compressed space in cosmos "because if it is a black hole, the incredibly strong gravitational field inside would tear apart every atom in your body. Even if it turns out to be a wormhole, the forces inside could still be deadly."
Even if one can survive this surrealistic vigor from cosmic force, the excruciatingly long transit time through wormholes, measured in billions of years, would make this journey impractical in our present reality.
Some physicists say that future particle accelerator experiments could produce microscopic black holes. Such tiny black holes would emit measurable amounts of Hawking radiation, proving that they are black holes rather than wormholes. But if Solodukhin is right, and microscopic wormholes are formed instead, no such radiation would be expected. "In that case, you would actually see if it is a black hole or a wormhole," he says.
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Could black holes be portals to other universes?