Comments by "Digital Footballer" (@digitalfootballer9032) on "The Speed of Light Reveals the Universe Must Be Stranger Than We Ever Imagined" video.

@Polaris431It would not appear simultaneously at every point in the universe, or for that matter at any two points at all to an outside observer. Outside observers clocks would be running normally, the time only dialates for those traveling aboard the vessel going the speed of light. In other words, for example if you, the outside observer fixed a telescope on an object one light year away and someone else traveled to that object at the speed of light, from your perspective you would not see them arrive for one year, but to them they would get there instantaneously and would not age one year as you did.
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I often wondered how that would work. For example, say you are on a ship traveling the speed of light, can you walk forward in the same direction as the ship without yourself exceeding light speed, or throw something the same direction the ship is traveling without that object exceeding light speed? Because of this, as well as other factors like needing exponentially less mass as you approach the speed of light, makes me think that it is likely impossible to create a man made object that can travel the speed of light.
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In practice it should be impossible for any objects with mass to travel the speed of light, not only because of the need for infinitely more energy and less mass as you approach C, but also there would need to be an infinite amount of energy used to stop the object at its destination, hence why it is theorized that to even go at say, 50% of C it wouldn't actually take you 2 years to travel 1 light year (from the perspective of an outside observer), it would take you longer because you would need to get up to speed, then take an equal amount of time to slow down.
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