• "Zero Gravity" ANALOGY to "Night" in a closed dark room (1/2)

    From Stuf4@21:1/5 to All on Sun May 4 02:31:28 2025
    This is a multi-part message in MIME format.
    "Zero Gravity" (/"microgravity") revisited, for hopefully the last time...

    Sabine Hossenfelder said many bogus things about gravity on Wednesday.
    She thinks Katy Perry experienced Zero Gravity /Microgravity:

    https://www.youtube.com/watch?v=QmZR6urktns&t=41s <https://www.youtube.com/watch?v=QmZR6urktns&t=41s>

    How is it that a well-respected person in physics, presenting herself as
    having earned a Physics PhD, can be so wrong about the most basic
    understanding of what gravity is, and what gravity isn't?  This has
    obviously been an issue for several decades, going back to the first
    years of spaceflight.  And NASA themselves continue to use utterly bogus
    terms like "zero gravity" and "microgravity" to characterize the
    environment of orbiting Earth, or suborbital missions, or flights in an airplane.  Let's be perfectly clear:

    There is absolutely no such thing as "zero gravity" nor "microgravity"
    ANYWHERE in our entire Solar System.  You have to get very far away
    before it goes down to micro- levels.  And nowhere in the entire
    universe does gravity ever go to zero.


    Let's try an analogy to help clarify the problem here...
    People go into a room with no windows and no lights.  They close the
    door behind them. Everyone says:

    "See how dark it is?  This is NIGHT!"

    Yet, you look at the watch on your wrist and it says it is high noon. 
    You step out of the room and see the Sun up in the sky. Everything is
    bright again.

    Sabine's position (along with NASA, and countless others) is essentially
    this:
    "NIGHT is the word agreed upon in science to describe the DARK condition experienced in that room with no lights and no windows.  Maybe 'night'
    is a misnomer.  Maybe it isn't.  But that's what the condition of
    darkness is called in English.  It is what scientists have agreed to
    call it."

    Are we now clear on exactly what the GROSS ERROR is here?
    Darkness due to nighttime and darkness due to lack of lighting are
    SEPARATE PHENOMENON.  For anyone to conflate the two, you have made the
    most basic fundamental error of failing to grasp what nighttime is.

    You simply cannot experience nighttime when it is high noon.  It is impossible.

    Yes, you most certainly can experience darkness.  But that is not the
    same thing.  There is darkness due to lack of light.  And there is
    darkness due to nighttime.

    Ok,
    Are we now ready to revisit gravity?
    There is zero acceleration due to lack of gravity.
    And there is zero acceleration due to freefall.
    (As measured locally within your spacecraft.)

    These are separate phenomena.  Again, you have to get EXTREMELY FAR away
    from Earth before its gravitational pull gets to any micro level.  And
    it NEVER gets down to exactly zero.  Nowhere in the entire universe.

    ~ CT

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    display: inline !important; float: none;">"Zero
    Gravity" (/"microgravity") revisited, for hopefully the last
    time...</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Sabine
    Hossenfelder said many bogus things about gravity on Wednesday. 
    She thinks Katy Perry experienced Zero Gravity /Microgravity:</span><br style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <a href="https://www.youtube.com/watch?v=QmZR6urktns&amp;t=41s"
    target="_blank" data-saferedirecturl="https://www.google.com/url?q=https://www.youtube.com/watch?v%3DQmZR6urktns%26t%3D41s&amp;source=gmail&amp;ust=1746427626638000&amp;usg=AOvVaw2MG6bD8FN4NxGi5NFcLHbS"
    style="color: rgb(17, 85, 204); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255);">https://www.youtube.com/watch?<wbr>v=QmZR6urktns&amp;t=41s</a><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">How
    is it that a well-respected person in physics, presenting
    herself as having earned a Physics PhD, can be so wrong about
    the most basic understanding of what gravity is, and what
    gravity isn't?  This has obviously been an issue for several
    decades, going back to the first years of spaceflight.  And NASA
    themselves continue to use utterly bogus terms like "zero
    gravity" and "microgravity" to characterize the environment of
    orbiting Earth, or suborbital missions, or flights in an
    airplane.  Let's be perfectly clear:</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">There
    is absolutely no such thing as "zero gravity" nor "microgravity"
    ANYWHERE in our entire Solar System.  You have to get very far
    away before it goes down to micro- levels.  And nowhere in the
    entire universe does gravity ever go to zero.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
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    <br
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Let's
    try an analogy to help clarify the problem here...</span><br style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">People
    go into a room with no windows and no lights.  They close the
    door behind them. Everyone says:</span><br
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    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">"See
    how dark it is?  This is NIGHT!"</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Yet,
    you look at the watch on your wrist and it says it is high
    noon.  You step out of the room and see the Sun up in the sky. 
    Everything is bright again.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Sabine's
    position (along with NASA, and countless others) is essentially
    this:</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">"NIGHT
    is the word agreed upon in science to describe the DARK
    condition experienced in that room with no lights and no
    windows.  Maybe 'night' is a misnomer.  Maybe it isn't.  But
    that's what the condition of darkness is called in English.  It
    is what scientists have agreed to call it."</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Are
    we now clear on exactly what the GROSS ERROR is here?</span><br style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    display: inline !important; float: none;">Darkness
    due to nighttime and darkness due to lack of lighting are
    SEPARATE PHENOMENON.  For anyone to conflate the two, you have
    made the most basic fundamental error of failing to grasp what
    nighttime is.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
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    <br
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    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;
    display: inline !important; float: none;">You
    simply cannot experience nighttime when it is high noon.  It is
    impossible.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;
    display: inline !important; float: none;">Yes,
    you most certainly can experience darkness.  But that is not the
    same thing.  There is darkness due to lack of light.  And there
    is darkness due to nighttime.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;
    display: inline !important; float: none;">Ok,</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;
    display: inline !important; float: none;">Are
    we now ready to revisit gravity?</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;
    display: inline !important; float: none;">There
    is zero acceleration due to lack of gravity.</span><br
    style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-
    indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;

    <span

    [continued in next message]

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