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Message: <blockquote data-quote="Turanil" data-source="post: 2397744" data-attributes="member: 9646">As most people in our western society, and probably everyone on these boards, I know that if a starship could travel at a speed close to that of light, time would pass much slower for it that it would pass for things immobile (or very slow). So, the starship for instance would travel a distance of two light years in three months of its own time, while two years passed on the planet it left (and the one it reaches).But now comes the things on which I would like to be enlightened (  <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin    :D"  data-smilie="8"data-shortname=":D" />  ):1) If a thing would travel at exactly 100% the speed of light (despite it is theoretically impossible and would require infinite energy expenditure), would time slow so much as to stop altogether, meaning the starship ceases to age if even for only one nanosecond? Or does time still pass at the speed of light. (I hope my question is comprehensible)Then, the related questions:2) Supposing time still pass when at 100% the speed of light. Inside the starship that travels at 100% light speed, someone has to go from the back of the starship to the front. So, with regard to things immobile outside of the starship, he is moving slightly faster than the speed of light; so would it be impossible to walk forward in the starship?3) Now, suppose time ceases to pass at exactly 100% of the speed of light. Fact is, a photon begins its travel from a star instantaneously at the speed of light; and then reaches a distant planet still at 100% of the speed of light. Between the moment when the photon was emited by the star, and the moment it reaches a planet, says that 5 years of local time have passed on said planet. However, since the photon travels at 100% light speed, no time at all passed for the photon. If indeed that is the case, at time 0 the photon is both at its point of departure and point of arrival 5 light-years-distance away. So the photon is simulateously at the same moment everywhere on the trajectory. Therefore, it could be said that subjectively the photon doesn't move at all, it exists in all places at the same moment. My question is that if I interpret things rightly, I wonder if there is not something extremely important lying there. Something about the nature of reality, of space and time itself, etc.So, any comment from those with scientific backgrounds on ENworld?Thanks.</blockquote>

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