Before she leaves, Sally agrees to flash a light back to you every second. Now imagine your colleague Sally is interested in more hands-on investigation of time inside a black hole, and decides to dive towards it. The light will appear to continually slow down as it approaches the black hole, ultimately reaching a complete dead stop at the event horizon. Unfortunately, you will be waiting a very long time-forever, in fact. Imagine you want to investigate a black hole by shining a light towards it and measuring the time that elapses before the light is reflected back to you. For this reason, an observer inside a black hole experiences the passage of time much differently than an outside observer. NASA/JPL-Caltechīlack holes are so massive that they severely warp the fabric of spacetime (the three spatial dimensions and time combined in a four-dimensional continuum). Step into the relativistic end of the wormhole, and you arrive back on Earth only one year after the wormhole was created, while you yourself may have had 40 years of time to pass.Artist's rendering of a black hole. "Well, a year isn't the same for everyone, particularly if they're moving through time and space differently! If we talk about the same speeds as we did earlier, the "in motion" end of the wormhole would have aged 40 years, but the "at rest" end would only have aged by one year. You then enter the rapidly moving end of the wormhole after it's been in motion for perhaps a year. " one end of the wormhole remains close to motionless, such as remaining close to Earth, while the other one goes off on a relativistic journey close to the speed of light. This is because time travels forward-but how much depends on how fast you are moving through space. If you were traveling somewhere 40 light years away at almost the speed of light, when you returned to Earth more than 80 years would have passed. "Your motion through space and your motion through time are related by the speed of light: The greater your motion through space, the less your motion through time." "If you travel close to the speed of light, you experience a phenomenon known as time dilation," Siegel writes. Once you have a wormhole, you then need the laws of special relativity to deal with the time aspect. This, he says, "should allow for a traversable wormhole." Once we had this, then we would need to create a supermassive black hole and negative mass/energy counterpart. First, it would involve the discovery of particles with a negative mass and energy. However, scaling this up so a human could pass through would be more difficult. If it lasted long enough, theoretically a particle could be transported through. If these two were then connected, you would have a wormhole. The different fluctuations would each create a curved space that opposes the other. He said that we first need to consider the wormhole-a portal through space created by energy fluctuations in positive and negative directions. In a blog post for Forbes, astrophysicist Ethan Siegel has explained just how-within the realms of Einstein's General Relativity-a person could travel through a wormhole and go back in time. Time travel through a wormhole is technically feasible under the rules of theoretical physics-the only catch is that we can only ever go backward.
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