Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 8 months ago

Should we classify planets by weight?

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  • 8 months ago

    Weight my friend is a concept easily construed as Mass

    On Earth we have Mass

    We also have an extra force added on to that, called Gravity

    Gravity plus Mass equals weight

    I am 87 Kg

    In the ISS I would still have the same Mass but without Gravity

     I would be in Orbit, a state of falling, but at a Velocity of Orbit that Keeps me at the same Altitude constantly

     In order to Change any of that we need external force

    To slow up or speed up

    Less Velocity will lower our Altitude, more, the opposite

    It is Newton's Third Law of Motion at work

     Anyway I diverge

    In orbit, bodies are considered weightless

    So Planets have Mass

    They would only have weight if you could add gravity to weightless objects

     So it doesn't make sense

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  • 8 months ago

    There is no "weight" in zero gravity. Only mass.

  • Tom S
    Lv 7
    8 months ago

    Planets by definition need to be in orbit of a star, objects in orbit are in a state of free-fall, so weightless.  Planets are weightless.

  • 8 months ago

    You do know that mass and weight aren't the same thing, right ?

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  • 8 months ago

    The weight of a planet is not its mass but a function of its diameter and mass.  It would be entirely feasible for a "puffy planet" orbiting close to its star to have the same weight as a rocky planet further out.  They would have very little else in common.

  • Anonymous
    8 months ago

    Sure. Why not. Break out the scale.

  • 8 months ago

    No, we should not, since the mass 

    of a planet already gives us a guesstimate of its weight.

  • Lôn
    Lv 7
    8 months ago

    No, by mass. .

  • ?
    Lv 7
    8 months ago

    And how exactly do we weigh them?

  • 8 months ago

    We more or less already do .  That's why Pluto was a planet, then wasn't (because it was considered too small), and then was again (because people were attached to it and complained).  There are thousands, maybe millions, of objects orbiting our Sun, we just call the large ones "planets".

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