Recent content by eltodesukane

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    Always closed... "Not open for further replies."

    Physics Forum useless. every time I try to reply it is closed even when opened just days ago why close any discussion? Physics Forum useless.
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    B What are the different types of equations and their names?

    expression = expression is the same as 0 = expression - expression
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    I What if the Earth (and the Universe) were 2d?

    Movies would be shown on a 1D screen.
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    B What happens to time as space is expanding?

    According to general relativity, time and space form spacetime. Spacetime is a fixed, frozen, unchanging, immutable 4-dimensional block. It includes all of space and all of time, all past and all future. It is not expanding, it is not moving, it is not changing. It does not sit in time, time is...
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    Modern file backup options: cloud? / HD?

    There are 2 kinds of hard drives, those who have failed, and those who will fail. Generally speaking, you can rely on your hard drive for 3 to 5 years on average. So any data you want to keep must have 2 copies beside the original, and those copies must be recopied every 3 years, and the hard...
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    A Can an Elephant Be Graphed? A Look at Von Neumann's Approach

    Elephant Walk (1954) (Director: William Dieterle) https://www.imdb.com/title/tt0046951/
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    Announcement Easy ways you can support Physics Forums

    Like this one: https://www.physicsforums.com/threads/nervous-about-james-webb-space-telescope.996215/
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    Announcement Easy ways you can support Physics Forums

    I don't want support cause each time I want post, I see " Not open for further replies." So forum useless.
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    B Why is the speed of light constant?

    Why is the speed of light constant? We don't know, we would need a deeper theory.
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    What is a Fibre Bundle? A 5 Minute Introduction

    "In the case of the Möbius strip, the fibre bundle ‘locally looks like’ the flat euclidean space R^2, however the overall topology is markedly different." -- I don't understand, each point of the space has a fiber. What is different with the Möbius strip? Does each point has 2 fibers?
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    Insights I Know the Math Says so, but Is It Really True?

    "Original Poster: I don’t understand how black holes can actually exist. Doesn’t it take an infinite time for anything to fall in? SA/Mentor: The “infinite time” is just coordinate time; if you calculate the proper time experienced by the infalling object when it reaches the horizon, it comes...
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    I Isn't it terrifying that AI can become smarter than any Mathematician?

    Isn't it terrifying that Mathematicians can become smarter than any non-Mathematician? Yes, but I don't lose sleep about it.
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    A Experimental test of shrinking matter theory?

    When we talk about the universe expanding, we mean the ratio (galaxy distance/galaxy size) is increasing. We use the scale factor a(t) to represent this. Whether (galaxy distance is increasing) or (galaxy size is decreasing) is equivalent. All we know is the ratio.
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    B Time Dilation: Orbit Earth at Light Speed, What Happens?

    Yes, everything will moves 2 times faster Please watch this episode for a similar situation: Star Trek Voyager 6-12-Blink of an Eye (2000) https://www.imdb.com/title/tt0708856/
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    I The Twin Paradox implies that the Universe as a whole is a special frame

    I would not rely on Martin Gardner to learn about relativity.